WO2015045556A1

WO2015045556A1 - Communication control device, communication control method, terminal device, and information processing device

Info

Publication number: WO2015045556A1
Application number: PCT/JP2014/068230
Authority: WO
Inventors: 高野　裕昭
Original assignee: ソニー株式会社
Priority date: 2013-09-26
Filing date: 2014-07-08
Publication date: 2015-04-02
Also published as: PH12016500534A1; EP3051850A1; CN105612770A; TR201802980T4; EP3051850B1; PH12016500534B1; KR20160061986A; MY177499A; JPWO2015045556A1; JP6503556B2; CN105612770B; US20160192171A1; EP3051850A4; CA2923387A1; US10531270B2; US20200092705A1

Abstract

[Problem] To make it possible to suppress the loads for devices performing inter-device communications (D2D communications). [Solution] Provided is a communication control device comprising: an acquisition unit for acquiring radio frame information indicating a radio frame that is a unit time of cellular communications and that is to be used for transmitting a discovery signal enabling a device, which is to perform an inter-device communication, to be discovered by another device; and a control unit for controlling the transmission of the radio frame information to a terminal device.

Description

COMMUNICATION CONTROL DEVICE, COMMUNICATION CONTROL METHOD, TERMINAL DEVICE, AND INFORMATION PROCESSING DEVICE

The present disclosure relates to a communication control device, a communication control method, a terminal device, and an information processing device.

Inter-device communication (D2D communication) is communication in which two or more terminal devices directly transmit and receive signals, unlike general cellular communication in which a base station and terminal devices transmit and receive signals. Therefore, in D2D communication, it is expected that a new usage form of the terminal device will be born, which is different from the general cellular communication. For example, information sharing by data communication between adjacent terminal devices or groups of adjacent terminal devices, information distribution from installed terminal devices, autonomous communication between devices called M2M (Machine to Machine), etc. Application is conceivable.

Also, D2D communication may be used for data offloading in response to a significant increase in data traffic due to the recent increase in smartphones. For example, in recent years, the need for transmission / reception of streaming data of moving images has increased rapidly. However, in general, since moving images have a large amount of data, there is a problem that many resources are consumed in a RAN (Radio Access Network). Therefore, if the terminal devices are in a state suitable for D2D communication, such as when the distance between the terminal devices is small, resource consumption and processing in the RAN can be reduced by offloading moving image data to D2D communication. The load can be suppressed. Thus, D2D communication has utility value for both communication carriers and users. Therefore, at present, D2D communication is recognized as one of the important technical fields necessary for LTE (Long Term Evolution) even in the 3GPP (3rd Generation Partnership Project) standardization conference, and is attracting attention.

For example, Non-Patent Document 1 discloses a use case for D2D communication.

However, for example, even if a discovery signal that enables another device to discover a device that performs D2D communication is transmitted by a terminal device that performs D2D communication, the other terminal device that performs D2D communication may We do not know when the signal is transmitted and received. Therefore, for example, the terminal device transmits the discovery signal with high frequency, and the other terminal device performs detection processing for detecting the discovery signal with high frequency. As a result, the load on the other terminal device may increase.

Therefore, it is desirable to provide a mechanism that makes it possible to reduce the load on a device that performs communication between devices (D2D communication).

According to the present disclosure, a radio frame that is a unit time of cellular communication and that indicates the radio frame for transmitting a discovery signal that enables another device to discover a device that performs inter-device communication. There is provided a communication control device including an acquisition unit that acquires frame information and a control unit that controls transmission of the radio frame information to a terminal device.

In addition, according to the present disclosure, a radio frame that is a unit time of cellular communication, and the radio frame for transmitting a discovery signal that enables another device to discover a device that performs inter-device communication. There is provided a communication control method including obtaining radio frame information to be indicated and controlling transmission of the radio frame information to a terminal device by a processor.

In addition, according to the present disclosure, a radio frame that is a unit time of cellular communication, and the radio frame for transmitting a discovery signal that enables another device to discover a device that performs inter-device communication. A terminal device is provided that includes an acquisition unit that acquires the indicated radio frame information and a control unit that controls transmission of the discovery signal based on the radio frame information.

Further, according to the present disclosure, an information processing apparatus including a memory that stores a program and one or more processors that can execute the program is provided. The program is a radio frame that is a unit time of cellular communication, and radio frame information indicating the radio frame for transmitting a discovery signal that enables another device to discover a device that performs inter-device communication Is obtained, and the transmission of the discovery signal is controlled based on the radio frame information.

Also, according to the present disclosure, a radio frame that is a unit time of cellular communication, and indicates a radio frame for transmitting a discovery signal that enables another device to discover a device that performs communication between devices. A terminal device is provided that includes an acquisition unit that acquires radio frame information and a control unit that controls detection processing for detecting the discovery signal based on the radio frame information.

Further, according to the present disclosure, an information processing apparatus including a memory that stores a program and one or more processors that can execute the program is provided. The program includes radio frame information indicating a radio frame that is a unit time of cellular communication and that transmits a discovery signal that enables another device to discover a device that performs communication between devices. It is a program for executing acquisition and controlling detection processing for detecting the discovery signal based on the radio frame information.

As described above, according to the present disclosure, it is possible to suppress a load on a device that performs communication between devices (D2D communication). The above effects are not necessarily limited, and any of the effects shown in the present specification or other effects that can be grasped from the present specification are exhibited together with or in place of the above effects. May be.

It is explanatory drawing for demonstrating the example of D2D communication. 2 is an explanatory diagram illustrating an example of a schematic configuration of a communication system according to an embodiment of the present disclosure. FIG. 3 is a block diagram illustrating an example of a configuration of a base station according to an embodiment of the present disclosure. FIG. It is explanatory drawing for demonstrating the example of the radio | wireless frame for transmitting a discovery signal. It is a block diagram showing an example of composition of a terminal unit concerning an embodiment of this indication. 5 is a flowchart illustrating an example of a schematic flow of a communication control process on a base station side according to an embodiment of the present disclosure. 5 is a flowchart illustrating an example of a schematic flow of a first communication control process on the terminal device side according to an embodiment of the present disclosure. 10 is a flowchart illustrating an example of a schematic flow of a second communication control process on the terminal device side according to an embodiment of the present disclosure. It is explanatory drawing for demonstrating an example of the correspondence of a radio | wireless frame and a meaning. 14 is a flowchart illustrating an example of a schematic flow of a first communication control process on the terminal device side according to a first modification of the embodiment of the present disclosure. 14 is a flowchart illustrating an example of a schematic flow of a second communication control process on the terminal device side according to a first modification of the embodiment of the present disclosure. It is explanatory drawing for demonstrating the example of the transmission period of the discovery signal according to the use of D2D communication. 14 is a flowchart illustrating an example of a schematic flow of a first communication control process on the terminal device side according to a second modification of the embodiment of the present disclosure. 14 is a flowchart illustrating an example of a schematic flow of a second communication control process on the terminal device side according to a second modification of the embodiment of the present disclosure. It is explanatory drawing for demonstrating the example of the predetermined several radio | wireless resource for transmitting the information which should be notified. 12 is a flowchart illustrating an example of a schematic flow of a communication control process on the base station side according to a third modification of the embodiment of the present disclosure. 14 is a flowchart illustrating an example of a schematic flow of a first communication control process on the terminal device side according to a third modification of the embodiment of the present disclosure. 14 is a flowchart illustrating an example of a schematic flow of a second communication control process on the terminal device side according to a third modification of the embodiment of the present disclosure. FIG. 16 is a sequence diagram illustrating an example of a schematic flow of a communication control process according to a fourth modification example of the embodiment of the present disclosure. It is explanatory drawing for demonstrating the example of the frequency of the detection process in a connection mode and an idle mode. It is explanatory drawing for demonstrating the example of the frequency of the detection process in a coverage, and the detection process in a coverage. 14 is a flowchart illustrating an example of a schematic flow of a communication control process on the terminal device side according to a fifth modification of the embodiment of the present disclosure. It is a block diagram which shows the 1st example of the schematic structure of eNB to which the technique which concerns on this indication can be applied. It is a block diagram which shows the 2nd example of the schematic structure of eNB to which the technique which concerns on this indication can be applied. It is a block diagram which shows an example of the schematic structure of the smart phone to which the technique which concerns on this indication can be applied. It is a block diagram which shows an example of a schematic structure of the car navigation apparatus with which the technique which concerns on this indication can be applied.

Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

The description will be made in the following order.
1. 1. Introduction 2. Schematic configuration of communication system Configuration of each communication node 3.1. Configuration of base station 3.2. 3. Configuration of terminal device Process flow Modification 5.1. First modification 5.2. Second modification 5.3. Third modification 5.4. Fourth modified example 5.5. Fifth modification example 6. Application example 6.1. Application examples related to base stations 6.2. 6. Application examples related to terminal devices Summary

<< 1. Introduction >>
First, with reference to FIG. 1, the technique and consideration regarding D2D communication are demonstrated.

(Use case of D2D communication)
Use cases for D2D communication are discussed in 3GPP SA (Service and Systems Aspects) 1 and the like, and described in TR 22.803. Note that TR 22.803 discloses a use case, but does not disclose a specific means for realizing it.

-Use of D2D communication In a normal LTE system, a base station and a terminal device perform wireless communication, but the terminal devices do not perform wireless communication with each other. However, there is a need for a technique in which terminal devices directly communicate with each other for public safety applications or other general applications.

用途 Public safety applications include, for example, collision prevention alarms and fire alarms. Since it is assumed that the use of public safety is often related to urgency, the reaction speed is considered to be important in D2D communication.

On the other hand, other general uses include, for example, data offloading. Data offloading by D2D communication can reduce the load on the cellular communication network.

-Coverage D2D communication may be performed within the coverage of the base station or may be performed outside the coverage of the base station. Alternatively, when one terminal device is located within the coverage of the base station and the other terminal device is located outside the coverage, D2D communication may be performed by these terminal devices, see FIG. 1 below. A specific example of a use case will be described.

FIG. 1 is an explanatory diagram for explaining an example of D2D communication. Referring to FIG. 1, a base station 11 and a plurality of terminal devices 21 (that is, terminal devices 21A to 21F) are shown. As a first example of D2D communication, the terminal device 21A and the terminal device 21B located in the cell 10 formed by the base station 11 (that is, the coverage of the base station 11) perform D2D communication. Such D2D communication is called D2D communication within coverage. As a second example of D2D communication, the terminal device 21C and the terminal device 21D located outside the cell 10 perform D2D communication. Such D2D communication is called out-of-coverage D2D communication. As a third example of D2D communication, a terminal device 21E located inside the cell 10 and a terminal device 21F located outside the cell 10 perform D2D communication. Such D2D communication is called partial coverage D2D communication. From the viewpoint of public safety, D2D communication out of coverage and D2D communication in partial coverage are also important.

(Flow to D2D communication)
For example, synchronization, discovery, and connection establishment are sequentially performed, and then D2D communication is performed.

-Synchronization When two terminal devices are located in the coverage of a base station (ie, a cell formed by the base station), the two terminal devices are connected to the base station using a downlink signal from the base station. By obtaining the synchronization, it is possible to synchronize with each other to some extent.

On the other hand, when at least one of the two terminal devices that intend to perform D2D communication is located outside the coverage of the base station (that is, a cell formed by the base station), for example, at least one of the two terminal devices. One transmits a synchronization signal for synchronization in D2D communication.

-Discovery Discovery is a process of identifying that a terminal device is near another terminal device. In other words, it can be said that discovery is a process in which a terminal device discovers another terminal device or a terminal device is discovered by another terminal device.

Discovery is performed, for example, by transmission / reception of a discovery signal (Discovery Signal) that enables another device to discover a device that performs D2D communication. More specifically, for example, one of the two terminal devices transmits a discovery signal, and the other terminal device of the two terminal devices receives the discovery signal. Then, the other terminal device attempts to communicate with the one terminal device.

It should be noted that the discovery signal is appropriately detected when the two terminal devices that are to perform D2D communication are synchronized in advance before transmission and reception of the discovery signal.

(Discovery signal)
When two terminal devices that intend to perform D2D communication are located within the coverage of the base station, the discovery signal transmitted by the two terminal devices is a signal transmitted and received between the base station and the terminal device. It is required not to collide with. Therefore, for example, according to control by the base station, one of the two devices attempting to perform D2D communication can transmit a discovery signal.

On the other hand, when two terminal devices that are to perform D2D communication are located outside the coverage of the base station, it is desirable that the discovery signal is transmitted by a contention based method. From the viewpoint of unified design, it is desirable to employ a contention-based method for both D2D communication within the coverage and D2D communication outside the coverage. However, as a matter of course, different methods may be adopted for each of the D2D communication within the coverage and the D2D communication outside the coverage.

The contention-based method means a method designed on the premise of signal collision such as random access. In the contention-based method, each terminal device transmits a signal based on its own judgment. A technique in which signal transmission by a terminal device is controlled by any control station is not a contention-based technique.

(Radio resource for D2D communication)
When D2D communication is performed within the coverage of the base station, it is not allowed to interfere with radio communication between the base station and the terminal device. Therefore, it is conceivable that a frame format for wireless communication between the base station and the terminal device is used as a frame format in D2D communication. For example, a radio frame and a subframe are used as a unit of time in D2D communication. The radio frame has a length of 10 ms, and the subframe has a length of 1 ms. As an example, a specific subframe in a radio frame is released as a radio resource for D2D communication. If the base station informs the terminal device of such radio resources for D2D communication, it is possible to avoid the interference of the D2D communication with the radio communication between the base station and the terminal device. For example, a resource block is used as a unit of radio resources in D2D communication. The resource block is a radio resource that covers 12 subcarriers in the frequency direction and covers 7 OFDM symbols in the time direction.

On the other hand, when D2D communication is performed outside the coverage of the base station, it may be considered that the possibility that the D2D communication interferes with the wireless communication between the base station and the terminal device is low. However, it is desirable to consider interference between different D2D communications, since different D2D communications can occur within a narrow area. For example, a contention based approach is used. Specifically, for example, when a signal is not properly transmitted and received due to a collision, the signal is retransmitted.

As described above, even in D2D communication, when the frame format for wireless communication between the base station and the terminal device is used, the radio resource of any subframe of the uplink radio resources is D2D. It can be used for communication. This is because, in the uplink, if no radio resource is allocated to any terminal apparatus in the subframe, no signal is transmitted in the subframe. On the other hand, on the downlink, even if no radio resource is assigned to any terminal apparatus, a reference signal is transmitted in any subframe. Therefore, on the downlink, the D2D communication signal and the reference signal may collide.

(Discovery load)
As a load on a terminal device related to discovery, there are a load of transmission of a discovery signal and a load of detection processing of a discovery signal. The load here may include a load in terms of power consumption, a load in terms of processing complexity, and the like.

<< 2. Schematic configuration of communication system >>
Next, a schematic configuration of the communication system 1 according to the embodiment of the present disclosure will be described with reference to FIG. FIG. 2 is an explanatory diagram illustrating an example of a schematic configuration of the communication system 1 according to the embodiment of the present disclosure. Referring to FIG. 2, the communication system 1 includes a base station 100 and a plurality of terminal devices 100. The communication system 1 is, for example, a system that complies with LTE, LTE-Advanced, or a communication method based on these.

(Base station 100)
The base station 100 performs wireless communication with the terminal device 200. For example, the base station 100 performs wireless communication with the terminal device 200 located in the cell 10.

(Terminal device 200)
The terminal device 200 performs wireless communication with the base station 100. For example, the terminal device 200 performs wireless communication with the base station 100 when located in the cell 10.

In particular, in the embodiment of the present disclosure, the terminal device 200 performs D2D communication with another terminal device 200. For example, when the terminal device 200 is located within the cell 10 (that is, the coverage of the base station 100), the terminal device 200 performs D2D communication within the coverage with another terminal device 200 located within the cell 10. Further, when the terminal device 200 is located in the cell 10, the terminal device 200 may perform D2D communication with partial coverage with another terminal device 200 located outside the cell 10. In addition, when the terminal device 200 is located outside the cell 10, the terminal device 200 may perform out-of-coverage D2D communication with another terminal device 200 located outside the cell 10, and the other terminal device located within the cell 10. Partial D2D communication with 200 may be performed.

Note that, for example, a frame format for wireless communication between a base station and a terminal device is used as a frame format for D2D communication. For example, a radio frame and a subframe are used as a unit of time in D2D communication. Furthermore, for example, also in D2D communication, OFDM (Orthogonal Frequency Division Multiplexing) is used, and resource blocks are used as units of radio resources. The resource block is a radio resource that covers 12 subcarriers in the frequency direction and covers 7 OFDM symbols in the time direction.

<< 3. Configuration of each communication node >>
Subsequently, configurations of the base station 100 and the terminal device 200 according to the embodiment of the present disclosure will be described with reference to FIGS. 3 to 5.

<3.1. Base station configuration>
First, an example of the configuration of the base station 100 according to the embodiment of the present disclosure will be described with reference to FIGS. 3 and 4. FIG. 3 is a block diagram illustrating an exemplary configuration of the base station 100 according to the embodiment of the present disclosure. Referring to FIG. 3, the base station 100 includes an antenna unit 110, a wireless communication unit 120, a network communication unit 130, a storage unit 140, and a processing unit 150.

(Antenna unit 110)
The antenna unit 110 radiates the signal output from the wireless communication unit 120 to space as a radio wave. Further, the antenna unit 110 converts radio waves in space into a signal and outputs the signal to the wireless communication unit 120.

(Wireless communication unit 120)
The wireless communication unit 120 performs wireless communication. For example, the radio communication unit 120 transmits a downlink signal to the terminal device 200 located in the cell 10 and receives an uplink signal from the terminal device 200 located in the cell 10.

(Network communication unit 130)
The network communication unit 130 communicates with other communication nodes. For example, the network communication unit 130 communicates with the core network and other base stations.

(Storage unit 140)
The storage unit 140 temporarily or permanently stores a program and data for the operation of the base station 100.

(Processing unit 150)
The processing unit 150 provides various functions of the base station 100. The processing unit 150 includes an information acquisition unit 151 and a communication control unit 153.

(Information acquisition unit 151)
The information acquisition unit 151 acquires information for control by the communication control unit 153.

In particular, in the embodiment of the present disclosure, the information acquisition unit 151 acquires radio frame information indicating a radio frame for transmitting a discovery signal. The radio frame is a unit time of cellular communication. The discovery signal is a signal that allows another device to discover a device that performs D2D communication.

The radio frame information indicates, for example, a system frame number (SFN) of the radio frame for transmitting a discovery signal. Hereinafter, a specific example of a radio frame for transmitting a discovery signal will be described with reference to FIG.

FIG. 4 is an explanatory diagram for explaining an example of a radio frame for transmitting a discovery signal. Referring to FIG. 4, a part of a series of radio frames having an SFN of 0 to 1023 is shown. For example, a radio frame for transmitting a discovery signal is a radio frame that arrives every period 31. That is, in this example, the period 31 is 10 radio frames (that is, 100 ms), and the radio frame for transmitting the discovery signal is a radio frame having an SFN that is an integer multiple of 10 (SFN is 0, 10, 20). And so on). For example, the discovery signal can be transmitted in such a period 31 when the reaction speed required for public safety applications is 0.1 seconds (ie, 100 ms).

The radio frame for transmitting the discovery signal is determined in advance, for example, and radio frame information indicating the radio frame is stored in the storage unit 140. The information acquisition unit 151 acquires the radio frame information from the storage unit 140. As an example, the radio frame information is included in system information, and the system information including the radio frame information is stored in the storage unit 140. Then, the information acquisition unit 151 acquires the system information including the radio frame information from the storage unit 140. When the wireless frame information is not stored in the storage unit 140 but is stored in another device, the information acquisition unit 151 receives the information from the other device via the network communication unit 130, for example. The radio frame information may be acquired.

The radio frame information may indicate the SFN by including the SFN itself of the radio frame in which the discovery signal is transmitted, and information for identifying the SFN (for example, an SFN cycle or an SFN condition) The SFN may be indicated by including

(Communication control unit 153)
The communication control unit 153 performs control related to wireless communication.

Particularly in the embodiment of the present disclosure, the communication control unit 153 controls transmission of the radio frame information to the terminal device 200.

For example, the radio frame information is transmitted as part of the system information. That is, the communication control unit 153 controls transmission of the radio frame information to the terminal device 200 so that the radio frame information is transmitted as part of the system information. As a specific process, for example, the communication control unit 153 maps the system information including the radio frame information to the radio resource allocated to the system information. As a result, the radio resource information is transmitted as part of the system information. Note that the radio frame information may be transmitted by individual signaling to the terminal device 200 instead of being transmitted as part of the system information.

Thereby, for example, it is possible to reduce the load on the terminal device 200 that performs D2D communication.

Specifically, for example, if the terminal device 200 performs detection processing for detecting a discovery signal on a signal transmitted in a radio frame for transmitting a discovery signal, the terminal device 200 can quickly and reliably detect the discovery signal. can do. Therefore, the terminal device 200 may not perform the detection process on a signal transmitted in a radio frame other than the radio frame. That is, the terminal device 200 does not have to perform the detection process frequently in order to quickly and reliably detect the discovery signal. Therefore, the load required for the discovery signal detection process can be suppressed.

For example, the terminal device 200 may transmit the discovery signal in a radio frame for transmitting the discovery signal, and may not transmit the discovery signal in a radio frame other than the radio frame. That is, the terminal device 200 does not need to transmit the discovery signal at a high frequency in order for the other terminal device 200 to quickly and reliably detect the discovery signal. Therefore, the load required for transmitting the discovery signal can be suppressed.

In general paging, since the radio frame from which the terminal device receives the paging message varies depending on the terminal device, the base station transmits the paging message at a high frequency for all the terminal devices. On the other hand, since the radio frame for receiving the discovery signal may be common among the terminal devices 200, the terminal device 200 may not transmit the discovery signal with high frequency. That is, the radio frame for transmitting the discovery signal may not appear as frequently as the paging frame. Therefore, the load required for transmitting the discovery signal can be suppressed.

<3.2. Configuration of terminal device>
Next, an example of a configuration of the terminal device 200 according to the embodiment of the present disclosure will be described with reference to FIG. FIG. 5 is a block diagram illustrating an exemplary configuration of the terminal device 200 according to the embodiment of the present disclosure. Referring to FIG. 5, the terminal device 200 includes an antenna unit 210, a wireless communication unit 220, a storage unit 230, an input unit 240, a display unit 250, and a processing unit 260.

(Antenna unit 210)
The antenna unit 210 radiates the signal output from the wireless communication unit 220 to the space as a radio wave. Further, the antenna unit 210 converts a radio wave in the space into a signal and outputs the signal to the wireless communication unit 220.

(Wireless communication unit 220)
The wireless communication unit 220 performs wireless communication. For example, when the terminal device 200 is located in the cell 10, the radio communication unit 220 receives a downlink signal from the base station 100 and transmits an uplink signal to the base station 100. For example, the radio communication unit 220 receives a signal from another terminal device 200 and transmits a signal to the other terminal device 200 in the D2D communication.

(Storage unit 230)
The storage unit 230 temporarily or permanently stores programs and data for the operation of the terminal device 200.

(Input unit 240)
The input unit 240 receives input from the user of the terminal device 200. Then, the input unit 240 provides the input result to the processing unit 260.

(Display unit 250)
The display unit 250 displays an output screen (that is, an output image) from the terminal device 200. For example, the display unit 250 displays an output screen in accordance with control by the processing unit 260 (display control unit 265).

(Processing unit 260)
The processing unit 260 provides various functions of the terminal device 200. The processing unit 260 includes an information acquisition unit 261, a communication control unit 263, and a display control unit 265.

(Information acquisition unit 261)
The information acquisition unit 261 acquires information for control by the communication control unit 263.

In particular, in the embodiment of the present disclosure, the information acquisition unit 261 acquires radio frame information indicating a radio frame for transmitting a discovery signal. The specific contents of the radio frame information are as described above.

For example, the radio frame information is transmitted by the base station 100 as part of the system information. In this case, the information acquisition unit 261 acquires the radio frame information included in the system information.

Note that the radio frame information may be transmitted by individual signaling to the terminal device 200 instead of being transmitted as part of the system information. Further, the radio frame information may not be transmitted by the base station 100 but may be stored in advance in the terminal device 200 (storage unit 230). This also applies to each modified example of the embodiment of the present disclosure described later.

(Communication control unit 263)
The communication control unit 263 performs control related to wireless communication of the terminal device 200.

Control for transmission of discovery signal For example, the terminal device 200 transmits a discovery signal as a transmission side of the discovery signal. In this case, the communication control unit 263 controls transmission of discovery signals based on the radio frame information.

Specifically, for example, when the terminal device 200 transmits a discovery signal, the communication control unit 263 transmits the discovery signal in the radio frame indicated by the radio frame information, and the discovery signal is transmitted in other radio frames. The discovery signal transmission is controlled so as not to be transmitted. As an example, referring to FIG. 4 again, the communication control unit 263 transmits a discovery signal in a radio frame having an SFN that is an integer multiple of 10 (a radio frame having an SFN of 0, 10, 20, or the like), and transmits other radio signals. The discovery signal transmission is controlled so that the discovery signal is not transmitted in the frame. The discovery signal is transmitted using, for example, a predetermined radio resource (for example, a predetermined resource block of a predetermined subframe) in the radio frame indicated by the radio frame information.

As a specific process, for example, the communication control unit 263 maps the discovery signal to a predetermined radio resource in the radio frame indicated by the radio frame information. As a result, the discovery signal is transmitted using the predetermined radio resource in the radio frame indicated by the radio frame information.

Control for Discovery Signal Detection For example, the terminal device 200 performs detection processing for detecting a discovery signal as a discovery signal reception side. In this case, the communication control unit 263 controls detection processing for detecting a discovery signal based on the radio frame information.

Specifically, for example, when the terminal device 200 performs a detection process for detecting a discovery signal, the communication control unit 263 performs the above process on the signal transmitted in the radio frame indicated by the radio frame information. The detection process is controlled so that the detection process is not performed on signals transmitted in other radio frames. As an example, referring to FIG. 4 again, the communication control unit 263 detects the above-described detection with respect to a signal transmitted in a radio frame having an SFN that is an integer multiple of 10 (a radio frame having an SFN of 0, 10, 20, etc.). The detection process is controlled so that the process is performed and the detection process is not performed on a signal transmitted in another radio frame. The detection process is performed on a signal transmitted with a predetermined radio resource (for example, a predetermined resource block of a predetermined subframe) in the radio frame indicated by the radio frame information.

As a specific process, for example, the communication control unit 263 determines whether a sequence of signals transmitted with a predetermined radio resource in the radio frame indicated by the radio frame information matches a discovery signal sequence. A discovery signal is detected when these sequences match, and no discovery signal is detected when these sequences do not match.

-Control related to transmission of system information including SFN The communication control unit 263 may control transmission of system information including a system frame number (SFN). That is, the terminal device 200 may transmit system information including SFN according to control by the communication control unit 263. As an example, the terminal device 200 may transmit an MIB (Master Information Block) including SFN in accordance with control by the communication control unit 263.

Thereby, for example, even when two or more terminal devices 200 are located outside the coverage (cell 10) of the base station 100, the SFN is shared between the two or more terminal devices 200. Is possible.

(Display control unit 265)
The display control unit 265 controls display of the output screen by the display unit 250. For example, the display control unit 265 generates an output screen displayed by the display unit 250 and causes the display unit 250 to display the output screen.

<< 4. Process flow >>
Subsequently, a communication control process according to an embodiment of the present disclosure will be described with reference to FIGS.

(Communication control processing on the base station side)
FIG. 6 is a flowchart illustrating an example of a schematic flow of communication control processing on the base station side according to the embodiment of the present disclosure.

First, the information acquisition unit 151 acquires system information including radio frame information indicating a radio frame for transmitting a discovery signal (S401).

The base station 100 transmits the system information including the radio frame information according to the control by the communication control unit 153 (S403). Then, the process ends.

Note that the communication control process described above is performed each time the system information is transmitted.

(First communication control process on the terminal device side: transmission of discovery signal)
FIG. 7 is a flowchart illustrating an example of a schematic flow of the first communication control process on the terminal device side according to the embodiment of the present disclosure. The first communication control process is a process performed when the terminal device 200 transmits a discovery signal.

When the radio frame is a radio frame for transmitting a discovery signal (S501: Yes), the terminal device 200 transmits the discovery signal in the radio frame according to the control by the communication control unit 263 (S503). . Then, the system frame number is incremented (S505), and the process is repeated.

On the other hand, when the radio frame is not a radio frame for transmitting the discovery signal (S501: No), the discovery signal is not transmitted. Then, the system frame number is incremented (S505), and the process is repeated.

(Second communication control processing on the terminal device side: discovery signal detection)
FIG. 8 is a flowchart illustrating an example of a schematic flow of the second communication control process on the terminal device side according to the embodiment of the present disclosure. The second communication control process is a process performed when the terminal device 200 performs a detection process for detecting a discovery signal.

When the radio frame is a radio frame for transmitting a discovery signal (S601: Yes), the terminal device 200 responds to the signal transmitted in the radio frame according to the control by the communication control unit 263. A detection process for detecting a discovery signal is performed (S603). Then, the system frame number is incremented (S605), and the process is repeated.

If the radio frame is not a radio frame for transmitting the discovery signal (S601: No), the detection process is not performed on the signal transmitted in the radio frame. Then, the system frame number is incremented (S605), and the process is repeated.

<< 5. Modification >>
Next, first to fifth modifications of the embodiment of the present disclosure will be described with reference to FIGS.

<5.1. First Modification>
First, a first modification of the embodiment of the present disclosure will be described with reference to FIGS. 9 to 11.

(Outline)
In the first modification, each of the plurality of radio frames to which the discovery signal is transmitted corresponds to any one of two or more meanings. Then, the transmission-side terminal device 200 transmits a discovery signal in a radio frame corresponding to the meaning to be notified, and the reception-side terminal device 200 has a meaning corresponding to the radio frame when the discovery signal is detected. Identify

Thus, for example, the receiving-side terminal device 200 can identify the meaning to be notified by the transmitting-side terminal device 200 only by transmitting and receiving a discovery signal. Therefore, it becomes possible to transmit the meaning quickly. More specifically, for example, in D2D communication, when data indicating meaning is transmitted / received after a connection is established through a plurality of transactions, the time required to transmit the meaning becomes long. On the other hand, when a discovery signal is transmitted and received in a radio frame corresponding to the meaning, the time required for transmitting the meaning is shortened. Therefore, the transmission of meaning becomes quick. In addition, since the urgency is high when the use of D2D communication is a use of public safety, such rapid transmission of meaning is particularly effective.

(Radio frame information)
In particular, in the first modification, the radio frame information indicates a plurality of radio frames for transmitting a discovery signal. As an example, as in the example illustrated in FIG. 4, the radio frame information indicates a radio frame having an SFN that is an integer multiple of 10 (a radio frame having an SFN of 0, 10, 20, or the like).

Further, particularly in the first modification, each of the plurality of radio frames corresponds to any one of two or more meanings. The two or more meanings include, for example, meanings related to public safety. Hereinafter, a specific example of the correspondence between the radio frame and the meaning will be described with reference to FIG.

FIG. 9 is an explanatory diagram for explaining an example of a correspondence relationship between a radio frame and a meaning. Referring to FIG. 9, the correspondence between meanings and radio frames is shown. For example, radio frames with SFN of 100, 200, and 300 correspond to the meaning of fire alarm, and radio frames with SFN of 500, 600, and 700 correspond to the meaning of theft alarm.

The example of the meaning shown in FIG. 9 (fire alarm and theft alarm) can also be said to be an application of D2D communication. Thus, each of the two or more meanings may coincide with the application of D2D communication.

Note that, for example, the radio frame information further indicates which of the two or more meanings corresponds to each of the plurality of radio frames. As an example, the radio frame information indicates a correspondence relationship as shown in FIG. 9, for example. Accordingly, for example, the terminal device 200 can know the correspondence relationship in advance. Of course, the radio frame information is a combination of information indicating the plurality of radio frames and information indicating which of the two or more meanings each of the plurality of radio frames corresponds to. Information may be included as separate information, or may be included as separate information.

(Base station 100: communication control unit 153)
As described above, the communication control unit 153 controls transmission of the radio frame information to the terminal device 200.

As described above, the radio frame information includes information indicating the plurality of radio frames and information indicating which of the two or more meanings corresponds to each of the plurality of radio frames. , May be included as separate information. In this case, the communication control unit 153 may control the transmission of the radio frame information so that the separate information is transmitted separately, and the radio frame so that the separate information is transmitted collectively. Information transmission may be controlled.

(Terminal device 200: communication control unit 263)
-Control related to transmission of discovery signal In particular, in the first modification, the communication control unit 263 transmits the discovery signal so that the discovery signal is transmitted in a radio frame corresponding to the meaning to be notified among the plurality of radio frames. Control transmission of

As a specific example, referring to FIG. 9 again, when the meaning to be notified is a fire alarm, a discovery signal is transmitted in a radio frame with SFN of 100, 200, and 300 according to control by the communication control unit 263. The Also, when the meaning to be notified is a theft alarm, a discovery signal is transmitted in a radio frame with SFN of 500, 600, and 700 in accordance with control by the communication control unit 263.

Note that the meaning to be notified (for example, fire alarm or theft alarm) is determined according to an application requesting D2D communication as an example.

-Control related to detection of discovery signal In particular, in the first modification, when the discovery signal is detected, the communication control unit 263 applies the detected discovery signal to the radio frame transmitted from the plurality of radio frames. Identify the corresponding meaning.

As a specific example, referring again to FIG. 9, when a discovery signal is detected in a radio frame having an SFN of 100, 200, or 300, the communication control unit 263 identifies a fire alarm as meaning corresponding to the radio frame. To do. When the discovery signal is detected in a radio frame having an SFN of 500, 600, or 700, the communication control unit 263 identifies a theft alarm as meaning corresponding to the radio frame.

(Processing flow: first communication control processing on the terminal device side: transmission of discovery signal)
FIG. 10 is a flowchart illustrating an example of a schematic flow of the first communication control process on the terminal device side according to the first modification of the embodiment of the present disclosure. The first communication control process is a process performed when the terminal device 200 transmits a discovery signal.

When the radio frame is a radio frame for transmitting a discovery signal (S511: Yes) and is a radio frame corresponding to the meaning to be notified (S513: Yes), the terminal device 200 uses the communication control unit. In response to control by H.263, a discovery signal is transmitted in the radio frame (S515). Then, the system frame number is incremented (S517), and the process is repeated.

On the other hand, when the radio frame is not a radio frame for transmitting the discovery signal (S511: No), or when the radio frame is not a radio frame corresponding to the meaning to be notified (S513: No), the discovery signal is not transmitted. . Then, the system frame number is incremented (S517), and the process is repeated.

(Processing flow: second communication control processing on the terminal device side: meaning identification)
FIG. 11 is a flowchart illustrating an example of a schematic flow of the second communication control process on the terminal device side according to the first modification of the embodiment of the present disclosure. The second communication control process is a process performed after the terminal device 200 detects a discovery signal.

First, the communication control unit 263 acquires the SFN of the radio frame in which the discovery signal is detected (S611).

And the communication control part 263 identifies the meaning corresponding to the radio | wireless frame which has acquired SFN among two or more meanings (S613). Then, the process ends.

<5.2. Second Modification>
Subsequently, a second modification example of the embodiment of the present disclosure will be described with reference to FIGS. 12 to 14.

(Outline)
In the second modification, the terminal device 200 on the transmission side transmits a discovery signal at a frequency according to the use of D2D communication. Further, the terminal device 200 on the receiving side performs detection processing for detecting a discovery signal at a frequency according to the use of D2D communication.

As a result, for example, it is possible to suppress power consumption in discovery while satisfying the time requirement for discovery.

Specifically, for example, the time required for discovery may vary depending on the application of D2D communication (for example, a collision alarm, a fire alarm, a burglar alarm, etc.). As an example, when the application of D2D communication is a collision alarm, the time required for discovery is required to be within the first time. However, when the application of D2D communication is a fire alarm, discovery is performed. The time required is required to be within a second time longer than the first time. In such a case, for example, when the frequency of the discovery signal is determined so that the time required for discovery is within the first time, the terminal device performs D2D communication for a fire alarm, Therefore, when D2D communication is not performed, the discovery signal is transmitted or detected more frequently than necessary. As a result, power can be wasted in transmitting or detecting discovery signals. On the other hand, for example, when the frequency of the discovery signal is determined so that the time required for discovery is within the second time, when the terminal device performs D2D communication for a collision warning, discovery is performed with insufficient frequency. Transmit or detect signals. As a result, the time requirement for discovery is not satisfied. Thus, by performing discovery signal transmission and detection processing at a frequency according to the application, it is possible to suppress power consumption in discovery while satisfying the time requirement for discovery.

(Radio frame information)
In particular, in the second modification, the radio frame information indicates a plurality of radio frames for transmitting a discovery signal at a frequency corresponding to the application for each application of D2D communication.

For example, the above-mentioned radio frame information indicates a discovery signal transmission cycle corresponding to the application for each application of D2D communication. That is, the radio frame information indicates a radio frame for transmission at a frequency according to the application by indicating a period according to the application. Hereinafter, with reference to FIG. 12, a specific example of a discovery signal transmission period according to the application of D2D communication will be described.

FIG. 12 is an explanatory diagram for explaining an example of a discovery signal transmission cycle according to the application of D2D communication. Referring to FIG. 12, a first cycle 33 of discovery signal transmission and a second cycle 35 of discovery signal transmission are shown. For example, the first period 33 is a period when the application of D2D communication is a collision alarm, and is 100 ms (10 radio frames). On the other hand, the second period 35 is a period when the application of D2D communication is a fire alarm, and is 300 ms (30 radio frames). In this way, discovery signals are transmitted at a period according to the application of D2D communication.

In addition, although the example in which the discovery signal is periodically transmitted has been described, the second modification is not limited to such an example. For example, the discovery signal may not be transmitted periodically (that is, at regular intervals) but may be transmitted at irregular intervals.

(Terminal device 200: communication control unit 263)
—Control Regarding Discovery Signal Transmission In particular, in the second modification, the communication control unit 263 controls the transmission of the discovery signal so that the discovery signal is transmitted at a frequency according to the use of the D2D communication.

For example, the communication control unit 263 controls transmission of the discovery signal so that the discovery signal is transmitted at a period according to the use of the D2D communication. As a specific example, referring again to FIG. 12, when the use of D2D communication for the terminal device 200 includes a collision warning, the terminal device 200 performs discovery in the first period 33 according to control by the communication control unit 263. Send a signal. That is, the terminal device 200 transmits a discovery signal every 10 radio frames (every 100 ms). Further, when the use of D2D communication for the terminal device 200 includes a fire alarm, the terminal device 200 transmits a discovery signal in the second period 35 in accordance with control by the communication control unit 263. That is, the terminal device 200 transmits a discovery signal every 30 radio frames (every 300 ms). Note that when the application of D2D communication for the terminal device 200 includes both a collision alarm and a fire alarm, the terminal device 200 transmits a discovery signal in the first period 33 and the second period 35.

In addition, the use (for example, a collision alarm, a fire alarm, a burglar alarm, etc.) of D2D communication is decided according to the application which requests | requires D2D communication as an example.

-Control related to detection of discovery signal In particular, in the second modification, the communication control unit 263 performs the detection process so that the detection process for detecting the discovery signal is performed at a frequency according to the use of the D2D communication. Control.

For example, the communication control unit 263 controls the detection process so that the detection process is performed at a cycle according to the use of D2D communication. As a specific example, referring again to FIG. 12, when the application of D2D communication for the terminal device 200 includes a collision warning, the terminal device 200 performs the above operation in the first period 33 according to the control by the communication control unit 263. Perform detection processing. That is, the terminal device 200 performs the detection process every 10 radio frames (every 100 ms). Further, when the application of D2D communication for the terminal device 200 includes a fire alarm, the terminal device 200 performs the detection process in the second period 35 in accordance with control by the communication control unit 263. That is, the terminal device 200 performs the detection process every 30 radio frames (every 300 ms). When the application of D2D communication for the terminal device 200 includes both a collision alarm and a fire alarm, the terminal device 200 performs the detection process in the first period 33 and the second period 35.

As described above, the use of D2D communication (for example, a collision alarm, a fire alarm, a burglar alarm, or the like) is determined according to an application requesting D2D communication as an example.

(Processing flow: first communication control processing on the terminal device side: transmission of discovery signal)
FIG. 13 is a flowchart illustrating an example of a schematic flow of a first communication control process on the terminal device side according to a second modification of the embodiment of the present disclosure. The first communication control process is a process performed when the terminal device 200 transmits a discovery signal.

When the radio frame is a radio frame for transmitting a discovery signal (S521: Yes) and a period corresponding to the use of D2D communication for the terminal device 200 arrives (S523: Yes), the terminal device 200 Transmits a discovery signal in the radio frame in accordance with control by the communication control unit 263 (S525). Then, the system frame number is incremented (S527), and the process is repeated.

On the other hand, when the radio frame is not a radio frame for transmitting a discovery signal (S521: No), or when a period corresponding to the use of D2D communication for the terminal device 200 does not arrive (S523: No), No discovery signal is sent. Then, the system frame number is incremented (S527), and the process is repeated.

(Processing flow: second communication control processing on the terminal device side: discovery signal detection)
FIG. 14 is a flowchart illustrating an example of a schematic flow of a second communication control process on the terminal device side according to a second modification of the embodiment of the present disclosure. The second communication control process is a process performed when the terminal device 200 performs a detection process for detecting a discovery signal.

When the radio frame is a radio frame for transmitting a discovery signal (S621: Yes) and a period corresponding to the use of D2D communication for the terminal device 200 arrives (S623: Yes), the terminal device 200 In response to control by the communication control unit 263, detection processing for detecting a discovery signal is performed on the signal transmitted in the radio frame (S625). Then, the system frame number is incremented (S627), and the process is repeated.

On the other hand, when the radio frame is not a radio frame for transmitting a discovery signal (S621: No), or when a period corresponding to the use of D2D communication for the terminal device 200 does not arrive (S623: No), The detection process is not performed on the signal transmitted in the radio frame. Then, the system frame number is incremented (S627), and the process is repeated.

<5.3. Third Modification>
Subsequently, a third modification example of the embodiment of the present disclosure will be described with reference to FIGS. 15 to 18.

(Outline)
In particular, in the third modification, the transmission-side terminal device 200 transmits information to be notified using a predetermined radio resource after transmitting the discovery signal. Also, the receiving-side terminal device 200 acquires information received by the predetermined radio resource after detecting the discovery signal.

This makes it possible to quickly transmit detailed information, for example.

Specifically, for example, when a radio frame corresponds to one of the meanings as in the first modification, it is possible to quickly transmit the meaning by transmitting and receiving a discovery signal. Is difficult to communicate. Further, if detailed information is transmitted / received after a connection is established through a plurality of transactions, the time required for transmitting the detailed information becomes longer. Therefore, by transmitting and receiving information to be notified using a predetermined radio resource after the discovery signal, it becomes possible to quickly transmit detailed information.

Note that when D2D communication is used for data offloading, a large amount of data is transmitted and received by D2D communication, so establishing a connection is effective. However, D2D communication is used for public safety. In some cases, the urgency is often high, so the method according to the third modification is effective.

(Base station 100: information acquisition unit 151)
In particular, in the third modification, the information acquisition unit 151 further acquires radio resource information indicating a predetermined radio resource for transmitting information to be notified after transmission of the discovery signal.

For example, the radio resource information indicates a plurality of predetermined radio resources for transmitting information to be notified after the discovery signal is transmitted. Hereinafter, a specific example of a plurality of predetermined radio resources for transmitting information to be notified will be described with reference to FIG.

FIG. 15 is an explanatory diagram for explaining an example of a plurality of predetermined radio resources for transmitting information to be notified. Referring to FIG. 15, a radio resource 41 for transmitting a discovery signal and a plurality of predetermined radio resources 43 (that is, radio resources 43A to 43J) for transmitting information to be notified are shown. The predetermined plurality of radio resources 43 are located after the radio resources 41 in the time direction. For example, the radio resource 41 is located at a fixed time in the radio frame, and is located in a fixed band in the entire frequency band. Each of the predetermined radio resources 43 is also located at a fixed time in the radio frame and is located in a fixed band in the entire frequency band. The radio resource 41 is a radio resource including, for example, one or more resource elements or one or more resource blocks. It is. Further, each of the radio resources 43A to 43J is a radio resource including one or more resource blocks, for example. Note that although an example in which a plurality of predetermined radio resources 43A to 43J are arranged in the time direction has been described, the embodiment of the present disclosure is not limited to such an example. The predetermined radio resources 43A to 43J may be arranged in the frequency direction, or may be discretely located in the frequency direction and / or the time direction.

The predetermined plural radio resources are determined in advance, for example, and radio resource information indicating the plural predetermined radio resources is stored in the storage unit 140. The information acquisition unit 151 acquires the radio resource information from the storage unit 140. As an example, the radio resource information is included in system information, and the system information including the radio resource information is stored in the storage unit 140. Then, the information acquisition unit 151 acquires the system information including the radio resource information from the storage unit 140. In addition, when the radio resource information is not stored in the storage unit 140 but is stored in another device, the information acquisition unit 151 receives the information from the other device via the network communication unit 130, for example. The radio resource information may be acquired.

(Base station 100: communication control unit 153)
In particular, in the third modification, the communication control unit 153 controls transmission of the radio resource information to the terminal device 200.

For example, the radio resource information is transmitted as part of the system information. That is, the communication control unit 153 controls transmission of the radio resource information to the terminal device 200 so that the radio resource information is transmitted as part of the system information. As a specific process, for example, the communication control unit 153 maps the system information including the radio resource information to the radio resource allocated to the system information. Thereby, the radio resource information is transmitted as part of the system information. Note that the radio resource information may be transmitted by individual signaling to the terminal device 200 instead of being transmitted as part of the system information.

(Terminal device 200: information acquisition unit 261)
In particular, in the third modification, the information acquisition unit 261 acquires radio resource information indicating a predetermined radio resource for transmitting information to be notified after transmission of the discovery signal. The specific contents of the radio frame information are as described above.

For example, the radio resource information is transmitted by the base station 100 as part of the system information. In this case, the information acquisition unit 261 acquires the radio resource information included in the system information.

Note that the radio resource may be transmitted by individual signaling to the terminal device 200 instead of being transmitted as part of the system information. Moreover, the said radio | wireless resource information may not be transmitted by the base station 100, but may be previously memorize | stored in the terminal device 200 (memory | storage part 230).

(Terminal device 200: communication control unit 263)
-Control concerning transmission of discovery signal In particular, in the third modification, the communication control unit 263 transmits the information to be notified so that the information to be notified is transmitted by a predetermined radio resource after the discovery signal is transmitted. To control.

--- First Response Considering Collisions Between Terminal Devices For example, the discovery signal has a common signal sequence between the terminal devices 200. Then, the communication control unit 263 controls the transmission of the information to be notified so that the information to be notified is transmitted using any one of a plurality of predetermined radio resources after the discovery signal is transmitted. .

As a specific example, referring to FIG. 15 again, according to the control by the communication control unit 263, the terminal device 200 transmits a discovery signal using the radio resource 41, and then notifies it using one of the radio resources 43A to 43J. To send information. As an example, the terminal device 200 transmits information to be notified using the radio resource 43A.

Note that another terminal device 200 can also transmit a discovery signal using the radio resource 41, and thereafter transmit information to be notified using any one of the radio resources 43A to 43J. In this case, both the terminal device 200 and another terminal device 200 transmit a discovery signal using the same radio resource 41, but the discovery signal is appropriately detected by the receiving-side terminal device 200. This is because, since the discovery signal sequence is common among the terminal devices 200, even if the discovery signals collide, the correlator appropriately detects the discovery signal in the same manner as the detection of the reflected wave. Further, as an example, another terminal device 200 transmits information to be notified using a radio resource other than the radio resource 43A among the radio resources 43A to 43J. Then, the information to be notified transmitted by the terminal device 200 and the information to be notified transmitted by another terminal device 200 are appropriately received and acquired by the terminal device 200 on the receiving side.

For example, as described above, the discovery signal has a common signal sequence between the terminal devices 200, and information to be notified is transmitted using any one of a plurality of predetermined radio resources. Thereby, for example, even if a plurality of terminal devices 200 transmit a discovery signal and information to be notified, the receiving-side terminal device can appropriately detect the discovery signal, and the information to be notified Is appropriately received and acquired by the terminal device on the receiving side.

--Second Response Considering Collisions Between Terminal Devices Even when a plurality of predetermined radio resources are prepared as described above, two or more terminal devices 200 are identical to each other (for example, FIG. 15). There is a possibility that information to be notified is transmitted by the wireless resource 43A) shown in FIG.

Therefore, for example, the communication control unit 263 determines that the radio resource to which the information to be notified is transmitted from any one of the plurality of predetermined radio resources each time the discovery signal is transmitted. The transmission of the information to be notified is controlled so as to change to another radio resource among the plurality of radio resources.

As a specific example, referring to FIG. 15 again, in response to control by the communication control unit 263, the terminal device 200 transmits a discovery signal using the radio resource 41 in a radio frame that transmits a discovery signal, and then transmits the radio resource 43A. Then, the information to be notified is transmitted. Further, in accordance with the control by the communication control unit 263, the terminal device 200 transmits the discovery signal by the wireless resource 41 in the next wireless frame for transmitting the discovery signal, and then any one of the wireless resources 43B to 43J. Then, the information to be notified is transmitted.

Note that the communication control unit 263 selects the i-th radio resource from among a plurality of predetermined radio resources as a radio resource for transmitting the information to be notified by the following formula, thereby discovering the radio resource. It can be changed for each signal transmission.

X is the SFN of the radio frame in which the discovery signal is transmitted. y is the ID of the terminal device 200 (for example, a unique ID in a SIM (Subscriber Identification Module) or C-RNTI (Cell-RadioioNetwork Temporary Identifier)). Z is the number of radio resources of a predetermined plurality of radio resources. Note that the communication control unit 263 may select a radio resource for transmitting the information to be notified, using a random number or the like instead of the above-described mathematical expression.

Thereby, for example, it is possible to reduce the possibility that two or more terminal devices 200 transmit information to be notified using the same radio resource.

-Control related to detection of discovery signal In particular, in the third modification, after detecting the discovery signal, the communication control unit 263 receives information received by a predetermined radio resource for transmitting information to be notified after transmission of the discovery signal. To get.

For example, after detecting the discovery signal, the communication control unit 263 acquires information received by each of a plurality of predetermined radio resources for transmitting information to be notified after the discovery signal is transmitted.

As a specific example, referring to FIG. 15 again, the terminal device 200 performs a detection process on a signal transmitted by the radio resource 41 in accordance with control by the communication control unit 263 and detects a discovery signal. Then, the communication control unit 263 acquires information received by each of the radio resources 43A to 43J. For example, information received by any of the radio resources 43A to 43J is information to be notified by the other terminal device 200 that has transmitted the discovery signal. Therefore, the communication control unit 263 acquires the information to be notified.

(Processing flow: Base station communication control processing)
FIG. 16 is a flowchart illustrating an example of a schematic flow of communication control processing on the base station side according to the third modification example of the embodiment of the present disclosure.

First, the information acquisition unit 151 acquires system information including radio resource information indicating a plurality of predetermined radio resources for transmitting information to be notified after transmission of a discovery signal (S431).

Then, the base station 100 transmits the system information including the radio resource information according to the control by the communication control unit 153 (S433). Then, the process ends.

(First communication control processing on the terminal device side: transmission of discovery signal etc.)
FIG. 17 is a flowchart illustrating an example of a schematic flow of the first communication control process on the terminal device side according to the third modification example of the embodiment of the present disclosure. The first communication control process is a process performed when the terminal device 200 transmits a discovery signal and information to be notified.

First, the communication control unit 263 selects a radio frame in which information to be notified is transmitted from a plurality of predetermined radio resources (S531).

If the radio frame is not a radio frame for transmitting a discovery signal (S533: No), the discovery signal is not transmitted. Then, the system frame number is incremented (S534), and the process returns to step S533.

On the other hand, when the radio frame is a radio frame for transmitting a discovery signal (S533: Yes), the terminal device 200 transmits the discovery signal in the radio frame according to the control by the communication control unit 263 ( S535). Furthermore, the terminal device 200 transmits information to be notified using the selected radio resource in accordance with control by the communication control unit 263 (S537). Then, the system frame number is incremented (S539), and the process returns to step S531.

(Second communication control processing on the terminal device side: acquisition of information to be notified)
FIG. 18 is a flowchart illustrating an example of a schematic flow of the second communication control process on the terminal device side according to the third modification example of the embodiment of the present disclosure. The second communication control process is a process performed after the terminal device 200 detects a discovery signal.

First, the terminal device 200 receives information on each of a plurality of predetermined radio resources (S631).

And the communication control part 263 acquires the information received by each of the said predetermined some radio | wireless resource (S633). Then, the process ends.

<5.4. Fourth Modification>
Subsequently, a fourth modification example of the embodiment of the present disclosure will be described with reference to FIG.

(Outline)
In the fourth modification, the base station 100 transmits individual transmission information related to a radio frame for the terminal device 200 to transmit a discovery signal by each of one or more terminal devices 200 located in the area. Then, the individual transmission information is acquired. Then, the one or more terminal devices 200 transmit aggregate transmission information related to a radio frame for transmitting a discovery signal.

Thereby, for example, when the terminal device 200 located in the area performs a detection process for detecting a discovery signal, the detection process can be performed with a necessary and sufficient radio frame. Therefore, it is possible to reduce the load on the terminal device 200.

Specifically, for example, when none of the terminal devices 200 located in the area transmits a discovery signal for a collision warning, the above detection processing is performed with a radio frame for transmitting the discovery signal for a collision warning. It is useless for the terminal device 200 that performs the detection process in the region. Therefore, by transmitting the aggregate transmission information to the terminal device 200, the terminal device 200 can identify necessary and sufficient radio frames to be subjected to the detection process. Therefore, the load on the terminal device 200 can be suppressed.

Further, in the fourth modification example, the base station 100 includes one or more terminal devices 200 that are located in the area and that have individual detection information related to a radio frame subjected to detection processing for the terminal device 200 to detect a discovery signal. The individual detection information is acquired. Then, the one or more terminal devices 200 transmit aggregate detection information related to a radio frame for performing the detection process.

Thereby, for example, the terminal device 200 located in the area can transmit the discovery signal in a necessary and sufficient radio frame when transmitting the discovery signal. Therefore, it is possible to reduce the load on the terminal device 200.

Specifically, for example, when none of the terminal devices 200 located in the area detects a discovery signal for collision warning, the discovery signal is transmitted in a radio frame for transmitting the discovery signal for collision warning. The transmission is useless for the terminal device 200 that transmits a discovery signal within the above-described region. Therefore, by transmitting the aggregate detection information to the terminal device 200, the terminal device 200 can identify a necessary and sufficient radio frame to which a discovery signal should be transmitted. Therefore, the load on the terminal device 200 can be suppressed.

(Base station 100: information acquisition unit 151)
-Individual transmission information In particular, in the fourth modification, for example, the information acquisition unit 151 includes one or more pieces of individual transmission information related to a radio frame for the terminal device 200 to transmit a discovery signal. When transmitted by each of the terminal devices 200, the individual transmission information is acquired.

The area is, for example, the coverage of the base station 100 (that is, the cell 10). Note that the area may be a smaller area included in the coverage (for example, one of a plurality of sectors included in the cell 10, an area corresponding to a beam formed by beam forming, or the like).

For example, a radio frame for transmitting a discovery signal is predetermined for each use of D2D communication. In this case, for example, the individual transmission information is information indicating the use of D2D communication for the terminal device 200. As a result, from the individual transmission information, it is possible to know in which radio frame the terminal apparatus 200 that has transmitted the individual transmission information transmits the discovery signal.

The individual transmission information is not limited to information indicating the use of D2D communication for the terminal device 200, and may be other information. For example, the individual transmission information may be information indicating a discovery signal transmission cycle by the terminal device 200. As a result, it becomes possible to know in what cycle the terminal device 200 that has transmitted the individual transmission information transmits the discovery signal from the individual transmission information, and as a result, the terminal device 200 that has transmitted the individual transmission information. Can know which radio frame transmits the discovery signal.

—Individual Detection Information In particular, in the fourth modification example, for example, the information acquisition unit 151 indicates that individual detection information related to a radio frame for performing detection processing for the terminal device 200 to detect a discovery signal is an area. When transmitted by each of the one or more terminal devices 200 located within, the individual detection information is acquired.

As described above in connection with the individual transmission information, the area is, for example, the coverage of the base station 100 (that is, the cell 10). Note that the area may be a smaller area included in the coverage.

For example, a radio frame for transmitting a discovery signal is predetermined for each use of D2D communication. In this case, the said individual detection information is information which shows the use of D2D communication for the terminal device 200, for example. Thereby, it can be understood from the individual detection information in which radio frame the terminal device 200 that has transmitted the individual detection information performs the detection process.

The individual detection information is not limited to information indicating the use of D2D communication for the terminal device 200, and may be other information. For example, the individual detection information may be information indicating the period of the detection process performed by the terminal device 200. As a result, it becomes possible to know from what individual detection information the terminal device 200 that has transmitted the individual detection information performs the detection process, and as a result, the terminal device 200 that has transmitted the individual detection information. It can be understood in which radio frame the detection processing is performed.

(Base station 100: communication control unit 153)
-Control related to transmission of aggregated transmission information In particular, in the fourth modification, the communication control unit 153 performs aggregation related to a radio frame for transmitting one or more terminal devices 200 that provide the individual transmission information to transmit a discovery signal. Control transmission of transmission information.

The aggregate transmission information is formed by aggregating information indicated by the individual transmission information provided by the one or more terminal devices 200, for example. Then, the generated aggregate transmission information is transmitted to the terminal device 200 in the area under the control of the communication control unit 153.

For example, a radio frame for transmitting a discovery signal is predetermined for each use of D2D communication. In this case, for example, the aggregate transmission information is information indicating the use of D2D communication for the one or more terminal devices 200. Thereby, it can be understood from the aggregated transmission information in which radio frame one or more terminal devices 200 located in the area transmit the discovery signal.

Note that the aggregate transmission information is not limited to information indicating the use of D2D communication for the terminal device 200, and may be other information. For example, the aggregate transmission information may be information indicating a discovery signal transmission cycle by one or more terminal devices 200 in the region. As a result, it becomes possible to know in what cycle one or more terminal devices 200 located in the region transmit the discovery signal from the aggregate transmission information, and as a result, one or more terminal devices in the region. It becomes possible to know which radio frame 200 transmits the discovery signal.

-Control related to transmission of aggregated detection information In particular, in the fourth modified example, the communication control unit 153 relates to a radio frame for one or more terminal devices 200 providing the individual detection information to perform the detection process. Control transmission of aggregated detection information.

The aggregate detection information is generated by, for example, aggregating information indicated by the individual detection information provided by the one or more terminal devices 200. Then, the generated aggregated detection signal information is transmitted to the terminal device 200 in the area under the control of the communication control unit 153.

For example, a radio frame for transmitting a discovery signal is predetermined for each use of D2D communication. In this case, for example, the aggregate detection information is information indicating the use of D2D communication for the one or more terminal devices 200. As a result, from the aggregate detection information, it is possible to know in which radio frame the one or more terminal devices 200 located in the region perform the detection process.

The aggregate detection information is not limited to information indicating the use of D2D communication for the terminal device 200, and may be other information. For example, the aggregate detection information may be information indicating the period of the detection process performed by one or more terminal devices 200 in the area. As a result, it becomes possible to know in what cycle one or more terminal devices 200 located in the area perform the detection process from the aggregated detection information, and as a result, one or more terminal devices in the area. It becomes possible to know which radio frame 200 performs the above detection process.

(Terminal device 200: information acquisition unit 261)
—Individual Transmission Information In particular, in the fourth embodiment, for example, the information acquisition unit 261 acquires individual transmission information related to a radio frame for the terminal device 200 to transmit a discovery signal. For example, the individual transmission information is stored in advance in the storage unit 230. Then, the information acquisition unit 261 acquires the individual transmission information from the storage unit 230.

—Individual Detection Information In particular, in the fourth embodiment, for example, the information acquisition unit 261 acquires individual detection information related to a radio frame for performing detection processing for the terminal device 200 to detect a discovery signal. . For example, the individual detection information is stored in advance in the storage unit 230. Then, the information acquisition unit 261 acquires the individual detection information from the storage unit 230.

-Aggregated Transmission Information In addition, particularly in the fourth embodiment, for example, the information acquisition unit 261 includes the aggregated transmission information related to a radio frame for transmitting one or more terminal devices 200 located in the area to transmit a discovery signal. To get. For example, the aggregate transmission information is transmitted by the base station 100 and received by the terminal device 200. Then, the information acquisition unit 261 acquires the received aggregate transmission information.

-Aggregation Detection Information Further, particularly in the fourth embodiment, for example, the information acquisition unit 261 includes the aggregation detection information related to a radio frame for one or more terminal devices 200 located in the area to perform the detection process. To get. For example, the aggregate detection information is transmitted by the base station 100 and received by the terminal device 200. Then, the information acquisition unit 261 acquires the received aggregate detection information.

(Terminal device 200: communication control unit 263)
—Control Regarding Transmission of Discovery——Transmission of Individual Transmission Information Particularly in the fourth embodiment, for example, the communication control unit 263 controls transmission of the individual transmission information to the base station 100.

For example, the communication control unit 263 maps the information signal including the individual transmission information to the uplink radio resource allocated to the terminal device 200. Thereby, the individual transmission information is transmitted to the base station 100.

--Transmission of Discovery Signal Based on Aggregation Detection Information Particularly in the fourth embodiment, for example, the communication control unit 263 controls the transmission of the discovery signal based on the aggregation detection information.

For example, the communication control unit 263 knows in which radio frame the one or more terminal devices 200 located in the area perform the detection process from the aggregated detection information. Then, the communication control unit 263 allows the terminal device 200 to discover a radio frame for the one or more terminal devices 200 to perform the detection process, out of the radio frames for the terminal device 200 to transmit the discovery signal. The signal is set as a radio frame for actually transmitting. Thereafter, the terminal device 200 transmits a discovery signal in the set radio frame and does not transmit a discovery signal in other radio frames.

As an example, the application of D2D communication for the terminal device 200 includes a first application (for example, a collision alarm) and a second application (for example, a fire alarm). The aggregated detection information does not include the first application for the use of D2D communication for any of the one or more terminal devices 200, and the use of the D2D communication for any of the one or more terminal devices 200. Includes the second application. In this case, the communication control unit 263 sets a radio frame for transmitting a discovery signal for D2D communication whose usage is the second usage as a radio frame for the terminal device 200 to actually transmit the discovery signal. . Thereafter, the terminal device 200 transmits a discovery signal using the set radio frame. That is, the terminal device 200 transmits a discovery signal in a radio frame corresponding to the second application, and in another radio frame (for example, a radio frame corresponding to the first application without corresponding to the second application). Do not send discovery signals.

—Control Regarding Detection of Discovery Signal——Transmission of Individual Detection Information Particularly in the fourth embodiment, for example, the communication control unit 263 controls transmission of the individual detection information to the base station 100.

For example, the communication control unit 263 maps the information signal including the individual detection information to the uplink radio resource allocated to the terminal device 200. As a result, the individual detection information is transmitted to the base station 100.

--Detection of Discovery Signal Based on Aggregated Transmission Information Particularly in the fourth embodiment, for example, the communication control unit 263 controls a detection process for detecting a discovery signal based on the aggregate transmission information.

For example, the communication control unit 263 knows in which radio frame the one or more terminal devices 200 located in the area transmit the discovery signal from the aggregate transmission information. Then, the communication control unit 263 indicates that, among the radio frames for the terminal device 200 to perform the detection process, the terminal device 200 actually transmits a radio frame for the one or more terminal devices 200 to transmit a discovery signal. Is set as a radio frame for performing the detection process. After that, the terminal device 200 performs the detection process with the set radio frame, and does not perform the detection process with another radio frame.

As an example, the application of D2D communication for the terminal device 200 includes a first application (for example, a collision alarm) and a second application (for example, a fire alarm). The aggregate transmission information does not include the first application for the use of D2D communication for any of the one or more terminal apparatuses 200, and the use of the D2D communication for any of the one or more terminal apparatuses 200. Includes the second application. In this case, the communication control unit 263 sets a radio frame for transmitting a discovery signal for D2D communication whose usage is the second usage as a radio frame on which the terminal device 200 actually performs the detection process. . Thereafter, the terminal device 200 performs the detection process with the set radio frame. That is, the terminal device 200 performs the above detection process for a radio frame corresponding to the second application, and for other radio frames (for example, a radio frame corresponding to the first application without corresponding to the second application). The above detection process is not performed.

(Process flow)
FIG. 19 is a sequence diagram illustrating an example of a schematic flow of a communication control process according to the fourth modification example of the embodiment of the present disclosure.

The terminal device 200 includes individual transmission information related to a radio frame for the terminal device 200 to transmit a discovery signal, and an individual transmission related to a radio frame for the detection processing for the terminal device 200 to detect a discovery signal. The detection information is transmitted to the base station 100 (S701). Then, the base station 100 acquires the individual detection information.

Then, the base station 100 relates to a radio frame for the one or more terminal devices 200 to transmit a discovery signal based on the individual transmission information transmitted by the one or more terminal devices 200 located in the area. The aggregate transmission information to be generated is generated (S703). Further, the ground station 100 relates to a radio frame for the one or more terminal devices 200 to perform the detection process based on the individual detection information transmitted by the one or more terminal devices 200 located in the area. The aggregate detection information to be generated is generated (S705). Then, the base station 100 transmits the aggregate transmission information and the aggregate detection information to the terminal device 200 (S707).

After that, the terminal device 200 sets a radio frame on which the terminal device 200 actually performs the detection process based on the aggregate transmission information (S709). Thereafter, the terminal device 200 performs the detection process with the set radio frame. Also, the terminal device 200 sets a radio frame that the terminal device 200 actually transmits a discovery signal based on the aggregated detection information (S711). Thereafter, the terminal device 200 transmits a discovery signal using the set radio frame.

<5.5. Fifth Modification>
Subsequently, a fifth modification example of the embodiment of the present disclosure will be described with reference to FIGS. 20 to 22.

(Outline)
In the fifth modified example, when the mode of the terminal device 200 is the connection mode, the terminal device 200 performs detection processing for detecting the discovery signal at the first frequency, and the mode of the terminal device 200 is idle. In the case of the mode, the detection process is performed at a second frequency lower than the first frequency.

Thereby, for example, it is possible to reduce the load on the terminal device 200 in the idle mode. Specifically, for example, in the idle mode, the frequency of the detection process by the terminal device 200 is reduced, so that the power consumption of the terminal device 200 can be suppressed.

(Terminal device 200: communication control unit 263)
In particular, in the fifth modification, the communication control unit 263 performs the detection so that the detection process for detecting the discovery signal is performed at the first frequency when the mode of the terminal device 200 is the connection mode. Control processing. Moreover, the communication control part 263 controls the said detection process so that the said detection process may be performed with the 2nd frequency lower than the said 1st frequency, when the mode of the terminal device 200 is an idle mode. For example, the connection mode is an RRC (Radio Resource Control) mode, and the idle mode is an RRC idle mode. Hereinafter, a specific example of the frequency of the detection process in the connection mode and the idle mode will be described with reference to FIG.

FIG. 20 is an explanatory diagram for explaining an example of the frequency of detection processing in the connection mode and the idle mode. Referring to FIG. 20, when the mode of the terminal device 200 is the connection mode, the terminal device 200 performs a detection process for detecting a discovery signal at the connection mode cycle 51. The cycle 51 for the connection mode is, for example, 100 ms. On the other hand, when the mode of the terminal device 200 is the idle mode, the terminal device 200 performs a detection process for detecting the discovery signal in the cycle 53 for the idle mode. The cycle 53 for idle mode is longer than the cycle 51, for example, 300 ms. Thus, in the case where the mode of the terminal device 200 is the idle mode, the frequency of the detection process is lower than in the case where the mode of the terminal device 200 is the connection mode.

Note that the communication control unit 263 performs the detection process at the third frequency when the terminal device 200 is located within the coverage of the base station 100 when the mode is the idle mode, and the terminal device 200 If it is located outside the coverage, the detection process may be controlled such that the detection process is performed at a fourth frequency lower than the third frequency. Hereinafter, a specific example of this point will be described with reference to FIG.

FIG. 21 is an explanatory diagram for explaining an example of the detection process in the coverage and the frequency of the detection process in the coverage. Referring to FIG. 21, when the mode of the terminal device 200 is the connection mode, the terminal device 200 performs a detection process for detecting a discovery signal in the connection mode cycle 51. As described above, the period 51 for the connection mode is, for example, 100 ms. Further, when the terminal device 200 is in the idle mode and the terminal device 200 is located within the coverage of the base station 100, the terminal device 200 performs the above detection process in the first period 55 for the idle mode. . The first period 55 for the idle mode is longer than the period 51 for the connection mode, for example, 300 ms. Further, when the terminal device 200 is in the idle mode and the terminal device 200 is located outside the coverage of the base station 100, the terminal device 200 performs the detection process in the second cycle 57 for the idle mode. . The second period 57 for the idle mode is longer than the first period 55 for the idle mode, for example, 600 ms. When the mode of the terminal device 200 is the idle mode, in the case where the terminal device 200 is located outside the coverage of the base station 100, the detection process is performed more than in the case where the terminal device 200 is located within the coverage of the base station 100. Infrequent.

Thereby, for example, it is possible to further reduce the load on the terminal device 200 located outside the coverage of the base station 100. Specifically, for example, when the terminal device 200 is located outside the coverage of the base station 100, the frequency of the detection processing by the terminal device 200 is particularly low, so the terminal device located outside the coverage of the base station 100 The power consumption of 200 can be suppressed. Outside the coverage of the base station 100, since the number of terminal devices 200 is small, the possibility that a discovery signal is transmitted is lower. Therefore, as described above, it is effective to reduce the frequency of the detection process outside the coverage.

(Process flow)
FIG. 22 is a flowchart illustrating an example of a schematic flow of a communication control process on the terminal device side according to the fifth modification example of the embodiment of the present disclosure. The communication control process is a process performed when the terminal device 200 whose mode is the idle mode performs a detection process for detecting a discovery signal.

When the radio frame is a radio frame for transmitting a discovery signal (S651: Yes) and the period for the idle mode arrives (S653: Yes), the terminal device 200 is controlled by the communication control unit 263. Accordingly, a detection process for detecting a discovery signal is performed on the signal transmitted in the radio frame (S655). Then, the system frame number is incremented (S657), and the process is repeated.

On the other hand, when the radio frame is not a radio frame for transmitting the discovery signal (S651: No), or when the period for the idle mode does not arrive (S653: No), the signal transmitted in the radio frame However, the above detection process is not performed. Then, the system frame number is incremented (S657), and the process is repeated.

<< 6. Application example >>
The technology according to the present disclosure can be applied to various products. For example, the base station 100 may be realized as any type of eNB (evolved Node B) such as a macro eNB or a small eNB. The small eNB may be an eNB that covers a cell smaller than a macro cell, such as a pico eNB, a micro eNB, or a home (femto) eNB. Instead, the base station 100 may be realized as another type of base station such as a NodeB or a BTS (Base Transceiver Station). Base station 100 may include a main body (also referred to as a base station apparatus) that controls radio communication, and one or more RRHs (Remote Radio Heads) that are arranged at locations different from the main body. Further, various types of terminals described later may operate as the base station 100 by temporarily or semi-permanently executing the base station function.

Further, for example, the terminal device 200 is a smartphone, a tablet PC (Personal Computer), a notebook PC, a portable game terminal, a mobile terminal such as a portable / dongle type mobile router or a digital camera, or an in-vehicle terminal such as a car navigation device. It may be realized as. The terminal device 200 may be realized as a terminal (also referred to as an MTC (Machine Type Communication) terminal) that performs M2M (Machine To Machine) communication. Further, the terminal device 200 may be a wireless communication module (for example, an integrated circuit module configured by one die) mounted on these terminals.

<6.1. Application examples for base stations>
(First application example)
FIG. 23 is a block diagram illustrating a first example of a schematic configuration of an eNB to which the technology according to the present disclosure may be applied. The eNB 800 includes one or more antennas 810 and a base station device 820. Each antenna 810 and the base station apparatus 820 can be connected to each other via an RF cable.

Each of the antennas 810 has a single or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna), and is used for transmission and reception of radio signals by the base station apparatus 820. The eNB 800 includes a plurality of antennas 810 as illustrated in FIG. 23, and the plurality of antennas 810 may respectively correspond to a plurality of frequency bands used by the eNB 800, for example. 23 shows an example in which the eNB 800 includes a plurality of antennas 810, the eNB 800 may include a single antenna 810.

The base station apparatus 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.

The controller 821 may be a CPU or a DSP, for example, and operates various functions of the upper layer of the base station apparatus 820. For example, the controller 821 generates a data packet from the data in the signal processed by the wireless communication interface 825, and transfers the generated packet via the network interface 823. The controller 821 may generate a bundled packet by bundling data from a plurality of baseband processors, and may transfer the generated bundled packet. In addition, the controller 821 is a logic that executes control such as radio resource control, radio bearer control, mobility management, inflow control, or scheduling. May have a typical function. Moreover, the said control may be performed in cooperation with a surrounding eNB or a core network node. The memory 822 includes RAM and ROM, and stores programs executed by the controller 821 and various control data (for example, terminal list, transmission power data, scheduling data, and the like).

The network interface 823 is a communication interface for connecting the base station device 820 to the core network 824. The controller 821 may communicate with the core network node or other eNB via the network interface 823. In that case, the eNB 800 and the core network node or another eNB may be connected to each other by a logical interface (for example, an S1 interface or an X2 interface). The network interface 823 may be a wired communication interface or a wireless communication interface for wireless backhaul. When the network interface 823 is a wireless communication interface, the network interface 823 may use a frequency band higher than the frequency band used by the wireless communication interface 825 for wireless communication.

The wireless communication interface 825 supports any cellular communication scheme such as LTE (Long Term Evolution) or LTE-Advanced, and provides a wireless connection to terminals located in the cell of the eNB 800 via the antenna 810. The wireless communication interface 825 may typically include a baseband (BB) processor 826, an RF circuit 827, and the like. The BB processor 826 may perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and each layer (for example, L1, MAC (Medium Access Control), RLC (Radio Link Control), and PDCP). Various signal processing of (Packet Data Convergence Protocol) is executed. The BB processor 826 may have some or all of the logical functions described above instead of the controller 821. The BB processor 826 may be a module that includes a memory that stores a communication control program, a processor that executes the program, and related circuits. The function of the BB processor 826 may be changed by updating the program. Good. Further, the module may be a card or a blade inserted into a slot of the base station apparatus 820, or a chip mounted on the card or the blade. On the other hand, the RF circuit 827 may include a mixer, a filter, an amplifier, and the like, and transmits and receives a radio signal via the antenna 810.

The wireless communication interface 825 includes a plurality of BB processors 826 as illustrated in FIG. 23, and the plurality of BB processors 826 may respectively correspond to a plurality of frequency bands used by the eNB 800, for example. Further, the wireless communication interface 825 includes a plurality of RF circuits 827 as shown in FIG. 23, and the plurality of RF circuits 827 may respectively correspond to a plurality of antenna elements, for example. 23 shows an example in which the wireless communication interface 825 includes a plurality of BB processors 826 and a plurality of RF circuits 827, the wireless communication interface 825 includes a single BB processor 826 or a single RF circuit 827. But you can.

(Second application example)
FIG. 24 is a block diagram illustrating a second example of a schematic configuration of an eNB to which the technology according to the present disclosure may be applied. The eNB 830 includes one or more antennas 840, a base station apparatus 850, and an RRH 860. Each antenna 840 and RRH 860 may be connected to each other via an RF cable. Base station apparatus 850 and RRH 860 can be connected to each other via a high-speed line such as an optical fiber cable.

Each of the antennas 840 has a single or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna), and is used for transmission / reception of radio signals by the RRH 860. The eNB 830 includes a plurality of antennas 840 as illustrated in FIG. 24, and the plurality of antennas 840 may respectively correspond to a plurality of frequency bands used by the eNB 830, for example. 24 shows an example in which the eNB 830 has a plurality of antennas 840, but the eNB 830 may have a single antenna 840.

The base station device 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855, and a connection interface 857. The controller 851, the memory 852, and the network interface 853 are the same as the controller 821, the memory 822, and the network interface 823 described with reference to FIG.

The wireless communication interface 855 supports a cellular communication method such as LTE or LTE-Advanced, and provides a wireless connection to a terminal located in a sector corresponding to the RRH 860 via the RRH 860 and the antenna 840. The wireless communication interface 855 may typically include a BB processor 856 and the like. The BB processor 856 is the same as the BB processor 826 described with reference to FIG. 23 except that the BB processor 856 is connected to the RF circuit 864 of the RRH 860 via the connection interface 857. The wireless communication interface 855 includes a plurality of BB processors 856 as illustrated in FIG. 24, and the plurality of BB processors 856 may respectively correspond to a plurality of frequency bands used by the eNB 830, for example. 24 shows an example in which the wireless communication interface 855 includes a plurality of BB processors 856, the wireless communication interface 855 may include a single BB processor 856.

The connection interface 857 is an interface for connecting the base station device 850 (wireless communication interface 855) to the RRH 860. The connection interface 857 may be a communication module for communication on the high-speed line that connects the base station apparatus 850 (wireless communication interface 855) and the RRH 860.

In addition, the RRH 860 includes a connection interface 861 and a wireless communication interface 863.

The connection interface 861 is an interface for connecting the RRH 860 (wireless communication interface 863) to the base station device 850. The connection interface 861 may be a communication module for communication on the high-speed line.

The wireless communication interface 863 transmits and receives wireless signals via the antenna 840. The wireless communication interface 863 may typically include an RF circuit 864 and the like. The RF circuit 864 may include a mixer, a filter, an amplifier, and the like, and transmits and receives wireless signals via the antenna 840. The wireless communication interface 863 includes a plurality of RF circuits 864 as illustrated in FIG. 24, and the plurality of RF circuits 864 may correspond to, for example, a plurality of antenna elements, respectively. 24 shows an example in which the wireless communication interface 863 includes a plurality of RF circuits 864, the wireless communication interface 863 may include a single RF circuit 864.

In the eNB 800 and the eNB 830 illustrated in FIGS. 23 and 24, the information acquisition unit 151 and the communication control unit 153 described with reference to FIG. 3 are implemented in the wireless communication interface 825, the wireless communication interface 855, and / or the wireless communication interface 863. May be. Further, at least a part of these functions may be implemented in the controller 821 and the controller 851.

<6.2. Application examples related to terminal devices>
(First application example)
FIG. 25 is a block diagram illustrating an example of a schematic configuration of a smartphone 900 to which the technology according to the present disclosure can be applied. The smartphone 900 includes a processor 901, a memory 902, a storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 912, one or more antenna switches 915. One or more antennas 916, a bus 917, a battery 918 and an auxiliary controller 919 are provided.

The processor 901 may be, for example, a CPU or a SoC (System on Chip), and controls the functions of the application layer and other layers of the smartphone 900. The memory 902 includes a RAM and a ROM, and stores programs executed by the processor 901 and data. The storage 903 can include a storage medium such as a semiconductor memory or a hard disk. The external connection interface 904 is an interface for connecting an external device such as a memory card or a USB (Universal Serial Bus) device to the smartphone 900.

The camera 906 includes, for example, an image sensor such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and generates a captured image. The sensor 907 may include a sensor group such as a positioning sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor. The microphone 908 converts sound input to the smartphone 900 into an audio signal. The input device 909 includes, for example, a touch sensor that detects a touch on the screen of the display device 910, a keypad, a keyboard, a button, or a switch, and receives an operation or information input from a user. The display device 910 has a screen such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) display, and displays an output image of the smartphone 900. The speaker 911 converts an audio signal output from the smartphone 900 into audio.

The wireless communication interface 912 supports any cellular communication method such as LTE or LTE-Advanced, and performs wireless communication. The wireless communication interface 912 may typically include a BB processor 913, an RF circuit 914, and the like. The BB processor 913 may perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and performs various signal processing for wireless communication. On the other hand, the RF circuit 914 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 916. The wireless communication interface 912 may be a one-chip module in which the BB processor 913 and the RF circuit 914 are integrated. The wireless communication interface 912 may include a plurality of BB processors 913 and a plurality of RF circuits 914 as illustrated in FIG. FIG. 25 illustrates an example in which the wireless communication interface 912 includes a plurality of BB processors 913 and a plurality of RF circuits 914. However, the wireless communication interface 912 includes a single BB processor 913 or a single RF circuit 914. But you can.

Furthermore, the wireless communication interface 912 may support other types of wireless communication methods such as a short-range wireless communication method, a proximity wireless communication method, or a wireless LAN (Local Area Network) method in addition to the cellular communication method. In that case, a BB processor 913 and an RF circuit 914 for each wireless communication method may be included.

Each of the antenna switches 915 switches the connection destination of the antenna 916 among a plurality of circuits (for example, circuits for different wireless communication systems) included in the wireless communication interface 912.

Each of the antennas 916 includes a single or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna), and is used for transmission / reception of a radio signal by the radio communication interface 912. The smartphone 900 may include a plurality of antennas 916 as illustrated in FIG. Note that although FIG. 25 illustrates an example in which the smartphone 900 includes a plurality of antennas 916, the smartphone 900 may include a single antenna 916.

Furthermore, the smartphone 900 may include an antenna 916 for each wireless communication method. In that case, the antenna switch 915 may be omitted from the configuration of the smartphone 900.

The bus 917 connects the processor 901, the memory 902, the storage 903, the external connection interface 904, the camera 906, the sensor 907, the microphone 908, the input device 909, the display device 910, the speaker 911, the wireless communication interface 912, and the auxiliary controller 919 to each other. . The battery 918 supplies power to each block of the smartphone 900 illustrated in FIG. 25 via a power supply line partially illustrated by a broken line in the drawing. For example, the auxiliary controller 919 operates the minimum necessary functions of the smartphone 900 in the sleep mode.

In the smartphone 900 illustrated in FIG. 25, the information acquisition unit 261 and the communication control unit 263 described with reference to FIG. 5 may be implemented in the wireless communication interface 912. In addition, at least a part of these functions may be implemented in the processor 901 or the auxiliary controller 919.

(Second application example)
FIG. 26 is a block diagram illustrating an example of a schematic configuration of a car navigation device 920 to which the technology according to the present disclosure can be applied. The car navigation device 920 includes a processor 921, a memory 922, a GPS (Global Positioning System) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, and wireless communication. The interface 933 includes one or more antenna switches 936, one or more antennas 937, and a battery 938.

The processor 921 may be a CPU or SoC, for example, and controls the navigation function and other functions of the car navigation device 920. The memory 922 includes RAM and ROM, and stores programs and data executed by the processor 921.

The GPS module 924 measures the position (for example, latitude, longitude, and altitude) of the car navigation device 920 using GPS signals received from GPS satellites. The sensor 925 may include a sensor group such as a gyro sensor, a geomagnetic sensor, and an atmospheric pressure sensor. The data interface 926 is connected to the in-vehicle network 941 through a terminal (not shown), for example, and acquires data generated on the vehicle side such as vehicle speed data.

The content player 927 reproduces content stored in a storage medium (for example, CD or DVD) inserted into the storage medium interface 928. The input device 929 includes, for example, a touch sensor, a button, or a switch that detects a touch on the screen of the display device 930, and receives an operation or information input from the user. The display device 930 has a screen such as an LCD or an OLED display, and displays a navigation function or an image of content to be reproduced. The speaker 931 outputs the navigation function or the audio of the content to be played back.

The wireless communication interface 933 supports any cellular communication method such as LTE or LTE-Advanced, and performs wireless communication. The wireless communication interface 933 may typically include a BB processor 934, an RF circuit 935, and the like. The BB processor 934 may perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and performs various signal processing for wireless communication. On the other hand, the RF circuit 935 may include a mixer, a filter, an amplifier, and the like, and transmits and receives a radio signal via the antenna 937. The wireless communication interface 933 may be a one-chip module in which the BB processor 934 and the RF circuit 935 are integrated. The wireless communication interface 933 may include a plurality of BB processors 934 and a plurality of RF circuits 935 as shown in FIG. 26 shows an example in which the wireless communication interface 933 includes a plurality of BB processors 934 and a plurality of RF circuits 935, the wireless communication interface 933 includes a single BB processor 934 or a single RF circuit 935. But you can.

Further, the wireless communication interface 933 may support other types of wireless communication methods such as a short-range wireless communication method, a proximity wireless communication method, or a wireless LAN method in addition to the cellular communication method. A BB processor 934 and an RF circuit 935 may be included for each communication method.

Each of the antenna switches 936 switches the connection destination of the antenna 937 among a plurality of circuits included in the wireless communication interface 933 (for example, circuits for different wireless communication systems).

Each of the antennas 937 has a single or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna), and is used for transmission / reception of a radio signal by the radio communication interface 933. The car navigation device 920 may include a plurality of antennas 937 as shown in FIG. FIG. 26 shows an example in which the car navigation apparatus 920 includes a plurality of antennas 937. However, the car navigation apparatus 920 may include a single antenna 937.

Furthermore, the car navigation device 920 may include an antenna 937 for each wireless communication method. In that case, the antenna switch 936 may be omitted from the configuration of the car navigation device 920.

The battery 938 supplies power to each block of the car navigation device 920 shown in FIG. 26 through a power supply line partially shown by broken lines in the drawing. Further, the battery 938 stores electric power supplied from the vehicle side.

In the car navigation apparatus 920 shown in FIG. 26, the information acquisition unit 261 and the communication control unit 263 described with reference to FIG. Further, at least a part of these functions may be implemented in the processor 921.

Also, the technology according to the present disclosure may be realized as an in-vehicle system (or vehicle) 940 including one or more blocks of the car navigation device 920 described above, an in-vehicle network 941, and a vehicle side module 942. The vehicle-side module 942 generates vehicle-side data such as vehicle speed, engine speed, or failure information, and outputs the generated data to the in-vehicle network 941.

<< 7. Summary >>
Up to this point, the communication device and each process according to the embodiment of the present disclosure have been described with reference to FIGS.

According to the embodiment of the present disclosure, in the terminal device 200, the information acquisition unit 261 acquires the radio frame information indicating the radio frame for transmitting the discovery signal, and the communication control unit 263 The discovery signal transmission is controlled based on the radio frame information. In the terminal device 200, the information acquisition unit 261 acquires radio frame information indicating a radio frame for transmitting the discovery signal, and the communication control unit 263 detects the discovery signal based on the radio frame information. Control the detection process. Also, for example, in the base station 100, the information acquisition unit 151 acquires radio frame information indicating a radio frame for transmitting a discovery signal. Then, the communication control unit 153 controls transmission of the radio frame information to the terminal device 200.

-First Modification In the first modification, the radio frame information indicates a plurality of radio frames for transmitting a discovery signal, and each of the plurality of radio frames has two or more meanings. Corresponds to one of the meanings. In the terminal device 200, the communication control unit 263 controls transmission of the discovery signal so that the discovery signal is transmitted in a radio frame corresponding to the meaning to be notified among the plurality of radio frames. In the terminal device 200, when the discovery signal is detected, the communication control unit 263 identifies the meaning corresponding to the radio frame to which the detected discovery signal is transmitted among the plurality of radio frames.

-Second Modification In the second modification, in the terminal device 200, the communication control unit 263 controls the transmission of the discovery signal so that the discovery signal is transmitted at a frequency according to the use of the D2D communication. In the terminal device 200, the communication control unit 263 controls the detection process so that the detection process is performed at a frequency according to the application of D2D communication.

-Third Modification In the third modification, in the terminal device 200, the communication control unit 263 is configured to notify the information to be notified after transmission of the discovery signal so that the information to be notified is transmitted with a predetermined radio resource. Control the transmission of information. Moreover, in the terminal device 200, the communication control part 263 acquires the information received by the predetermined | prescribed radio | wireless resource for transmitting the information which should be notified after transmission of a discovery signal after the detection of a discovery signal. Also, for example, in the base station 100, the information acquisition unit 151 acquires radio resource information indicating a predetermined radio resource for transmitting information to be notified after transmission of the discovery signal, and the communication control unit 153 The transmission of the resource information to the terminal device 200 is controlled.

This makes it possible to quickly transmit detailed information, for example.

-Fourth modification

--- Individual transmission information and aggregated transmission information In the fourth modification example, in the base station 100, for example, the information acquisition unit 151 indicates that the individual transmission information related to the radio frame for the terminal device 200 to transmit the discovery signal is When transmitted by each of one or more terminal devices 200 located in the area, the individual transmission information is acquired. Then, the communication control unit 153 controls transmission of aggregate transmission information related to a radio frame for the one or more terminal devices 200 to transmit a discovery signal.

In the terminal device 200, the information acquisition unit 261 acquires individual transmission information related to a radio frame for the terminal device 200 to transmit a discovery signal, and the communication control unit 263 includes the base station 100 of the individual transmission information. Control transmission to Further, in the terminal device 200, the information acquisition unit 261 acquires aggregate transmission information related to a radio frame for transmitting one or more terminal devices 200 located in the area, and the communication control unit 263 The detection process is controlled based on the aggregate transmission information.

--Individual detection information and aggregated detection information Further, in the fourth modification example, in the base station 100, for example, the information acquisition unit 151 performs a radio frame for performing detection processing for the terminal device 200 to detect a discovery signal. When the individual detection information related to is transmitted by each of the one or more terminal devices 200 located in the region, the individual detection information is acquired. Then, the communication control unit 153 controls transmission of aggregate detection information related to a radio frame for the one or more terminal devices 200 to perform the detection process.

In the terminal device 200, the information acquisition unit 261 acquires individual detection information related to a radio frame for the terminal device 200 to perform the detection process, and the communication control unit 263 includes the base station 100 of the individual detection information. Control transmission to Further, in the terminal device 200, the information acquisition unit 261 acquires aggregated detection information related to a radio frame for performing detection processing for one or more terminal devices 200 located in the region to detect a discovery signal. The communication control unit 263 controls the discovery signal transmission based on the aggregate detection information.

-Fifth modification

In the fifth modification, in the terminal device 200, the communication control unit 263 performs the above detection process at the first frequency when the mode of the terminal device 200 is the connection mode, and the mode of the terminal device 200 is idle. When in the mode, the detection process is controlled so that the detection process is performed at a second frequency lower than the first frequency.

As mentioned above, although preferred embodiment of this indication was described referring an accompanying drawing, it cannot be overemphasized that this indication is not limited to the example concerned. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are of course within the technical scope of the present disclosure. Is done.

For example, although the example in which the communication system is a system according to LTE, LTE-Advanced, or a communication method based on these has been described, the present disclosure is not limited to such an example. For example, the communication system may be a system according to another communication standard.

Also, the processing steps in the communication control processing of this specification do not necessarily have to be executed in time series in the order described in the flowchart. For example, the processing steps in the communication control process may be executed in an order different from the order described in the flowchart, or may be executed in parallel.

In addition, hardware such as a CPU, ROM, and RAM incorporated in a communication control device (for example, a device included in a base station) or a terminal device exhibits functions equivalent to the respective configurations of the communication control device or the terminal device. A computer program can be created. A storage medium storing the computer program may also be provided. Further, an information processing apparatus (for example, a processing circuit, a chip) including a memory (for example, ROM and RAM) for storing the computer program and one or more processors (for example, CPU, DSP, etc.) capable of executing the computer program. ) May also be provided.

In addition, the effects described in the present specification are merely illustrative or illustrative, and are not limited. That is, the technology according to the present disclosure can exhibit other effects that are apparent to those skilled in the art from the description of the present specification in addition to or instead of the above effects.

The following configurations also belong to the technical scope of the present disclosure.
(1)
Acquisition of radio frame information indicating the radio frame for transmitting a discovery signal that is a radio frame that is a unit time of cellular communication and that allows another device to discover a device that performs inter-device communication And
A control unit that controls transmission of the radio frame information to the terminal device;
A communication control device comprising:
(2)
The communication control apparatus according to (1), wherein the radio frame information indicates a system frame number of the radio frame.
(3)
The radio frame information indicates a plurality of radio frames for transmitting the discovery signal,
Each of the plurality of radio frames corresponds to any one of two or more meanings;
The communication control device according to (1) or (2).
(4)
The communication control device according to (3), wherein the radio frame information further indicates which of the two or more meanings corresponds to each of the plurality of radio frames.
(5)
The communication according to any one of (1) to (4), wherein the radio frame information indicates a plurality of radio frames for transmitting the discovery signal at a frequency according to a use for each use of communication between devices. Control device.
(6)
The said wireless frame information is a communication control apparatus as described in said (5) which shows the period of transmission of the said discovery signal according to a use for every use of communication between apparatuses.
(7)
The acquisition unit acquires radio resource information indicating a predetermined radio resource for transmitting information to be notified after transmission of the discovery signal,
The control unit controls transmission of the radio resource information to a terminal device;
The communication control apparatus according to any one of (1) to (6).
(8)
The discovery signal has a common signal sequence between terminal devices,
The radio resource information indicates a plurality of predetermined radio resources for transmitting the information to be notified after transmission of the discovery signal.
The communication control device according to (7).
(9)
When the individual transmission information related to the radio frame for the terminal device to transmit the discovery signal is transmitted by each of the one or more terminal devices located in the region, the acquisition unit transmits the individual transmission information. Acquired,
The control unit controls transmission of aggregate transmission information related to a radio frame for the one or more terminal devices to transmit the discovery signal;
The communication control apparatus according to any one of (1) to (8).
(10)
The communication control device according to (9), wherein the individual transmission information is information indicating a use of inter-device communication for the terminal device or information indicating a cycle of transmission of the discovery signal by the terminal device.
(11)
The acquisition unit is configured to transmit individual detection information related to a radio frame for performing a detection process for the terminal device to detect the discovery signal by each of one or more terminal devices located in the region. , Get the individual detection information,
The control unit controls transmission of aggregate detection information related to a radio frame for the one or more terminal devices to perform the detection process.
The communication control apparatus according to any one of (1) to (10).
(12)
The said individual detection information is a communication control apparatus as described in said (11) which is the information which shows the use of the communication between apparatuses for a terminal device, or the information which shows the period of the said detection process by a terminal device.
(13)
Obtaining radio frame information indicating a radio frame that is a unit time of cellular communication, and indicating the radio frame for transmitting a discovery signal that enables another device to discover a device that performs inter-device communication When,
Controlling transmission of the radio frame information to the terminal device by a processor;
Including a communication control method.
(14)
Acquisition of radio frame information indicating the radio frame for transmitting a discovery signal that is a radio frame that is a unit time of cellular communication and that allows another device to discover a device that performs inter-device communication And
A control unit that controls transmission of the discovery signal based on the radio frame information;
A terminal device comprising:
(15)
The radio frame information indicates a plurality of radio frames for transmitting the discovery signal,
Each of the plurality of radio frames corresponds to any one of two or more meanings;
The control unit controls transmission of the discovery signal so that the discovery signal is transmitted in a radio frame corresponding to a meaning to be notified among the plurality of radio frames.
The terminal device according to (14).
(16)
The terminal device according to (14) or (15), wherein the control unit controls transmission of the discovery signal so that the discovery signal is transmitted at a frequency according to a purpose of inter-device communication.
(17)
The said control part is a terminal device as described in said (16) which controls transmission of the said discovery signal so that the said discovery signal is transmitted with the period according to the use of communication between apparatuses.
(18)
Any of (14) to (17), wherein the control unit controls transmission of the information to be notified so that the information to be notified is transmitted using a predetermined radio resource after the discovery signal is transmitted. The terminal device according to item 1.
(19)
The discovery signal has a common signal sequence between terminal devices,
The control unit controls transmission of the information to be notified so that the information to be notified is transmitted by any one of a plurality of predetermined radio resources after the discovery signal is transmitted;
The terminal device according to (18).
(20)
The control unit transmits the predetermined plurality of radio resources from any one of the predetermined plurality of radio resources each time the discovery signal is transmitted. The terminal device according to (19), wherein transmission of the information to be notified is controlled so as to change to another radio resource among resources.
(21)
The acquisition unit acquires individual transmission information related to a radio frame for the terminal device to transmit the discovery signal,
The control unit controls transmission of the dedicated transmission information to a base station;
The terminal device according to any one of (14) to (20).
(22)
The acquisition unit acquires aggregated detection information related to a radio frame for performing detection processing for detecting one or more terminal devices located in a region to detect the discovery signal,
The control unit controls transmission of the discovery signal based on the aggregate detection information.
The terminal device according to any one of (14) to (21).
(23)
The terminal device according to any one of (14) to (22), wherein the control unit controls transmission of system information including a system frame number.
(24)
A memory for storing the program;
One or more processors capable of executing the program;
With
The program is
Obtaining radio frame information indicating a radio frame that is a unit time of cellular communication, and indicating the radio frame for transmitting a discovery signal that enables another device to discover a device that performs inter-device communication When,
Controlling transmission of the discovery signal based on the radio frame information;
Is a program for executing
Information processing device.
(25)
An acquisition unit for acquiring radio frame information indicating a radio frame for transmitting a discovery signal that is a radio frame that is a unit time of cellular communication and that allows another device to discover a device that performs inter-device communication When,
A control unit for controlling a detection process for detecting the discovery signal based on the radio frame information;
A terminal device comprising:
(26)
The radio frame information indicates a plurality of radio frames for transmitting the discovery signal,
Each of the plurality of radio frames corresponds to any one of two or more meanings;
When the discovery signal is detected, the control unit identifies a meaning corresponding to a radio frame in which the detected discovery signal is transmitted among the plurality of radio frames.
The terminal device according to (25).
(27)
The said control part is a terminal device as described in said (25) or (26) which controls the said detection process so that the said detection process is performed with the frequency according to the use of communication between apparatuses.
(28)
The said control part is a terminal device as described in said (27) which controls the said detection process so that the said detection process is performed with the period according to the use of communication between apparatuses.
(29)
The control unit acquires information received by a predetermined radio resource for transmitting information to be notified after transmission of the discovery signal after detection of the discovery signal, any of (25) to (28) The terminal device according to claim 1.
(30)
The control unit obtains information received by each of a plurality of predetermined radio resources for transmitting the information to be notified after transmission of the discovery signal after detection of the discovery signal. The terminal device described.
(31)
The acquisition unit acquires aggregate transmission information related to a radio frame for transmitting one or more terminal devices located in a region to transmit the discovery signal,
The control unit controls the detection process based on the aggregate transmission information.
The terminal device according to any one of (25) to (30).
(32)
The acquisition unit acquires individual detection information related to a radio frame for the terminal device to perform the detection process,
The control unit controls transmission of the individual detection information to a base station;
The terminal device according to any one of (25) to (31).
(33)
The control unit performs the detection process at a first frequency when the mode of the terminal device is a connection mode, and more than the first frequency when the mode of the terminal device is an idle mode. The terminal device according to any one of (25) to (32), wherein the detection process is controlled so that the detection process is performed at a low second frequency.
(34)
The terminal device according to any one of (25) to (33), wherein the control unit controls transmission of system information including a system frame number.
(35)
A memory for storing the program;
One or more processors capable of executing the program;
With
The program is
Acquiring radio frame information indicating a radio frame that is a unit time of cellular communication and that transmits a discovery signal that enables another device to discover a device that performs inter-device communication; ,
Controlling a detection process for detecting the discovery signal based on the radio frame information;
Is a program for executing
Information processing device.

DESCRIPTION OF SYMBOLS 1 Communication system 100 Base station 151 Information acquisition part 153 Communication control part 200 Terminal device 261 Information acquisition part 263 Communication control part

Claims

Acquisition of radio frame information indicating the radio frame for transmitting a discovery signal that is a radio frame that is a unit time of cellular communication and that allows another device to discover a device that performs inter-device communication And
A control unit that controls transmission of the radio frame information to the terminal device;
A communication control device comprising:
The communication control device according to claim 1, wherein the radio frame information indicates a system frame number of the radio frame.
The radio frame information indicates a plurality of radio frames for transmitting the discovery signal,
Each of the plurality of radio frames corresponds to any one of two or more meanings;
The communication control apparatus according to claim 1.
The communication control device according to claim 3, wherein the radio frame information further indicates which of the two or more meanings each of the plurality of radio frames corresponds to.
The communication control apparatus according to claim 1, wherein the radio frame information indicates a plurality of radio frames for transmitting the discovery signal at a frequency according to a use for each use of communication between apparatuses.
The communication control device according to claim 5, wherein the radio frame information indicates a transmission cycle of the discovery signal corresponding to a use for each use of communication between devices.
The acquisition unit acquires radio resource information indicating a predetermined radio resource for transmitting information to be notified after transmission of the discovery signal,
The control unit controls transmission of the radio resource information to a terminal device;
The communication control apparatus according to claim 1.
The discovery signal has a common signal sequence between terminal devices,
The radio resource information indicates a plurality of predetermined radio resources for transmitting the information to be notified after transmission of the discovery signal.
The communication control apparatus according to claim 7.
When the individual transmission information related to the radio frame for the terminal device to transmit the discovery signal is transmitted by each of the one or more terminal devices located in the region, the acquisition unit transmits the individual transmission information. Acquired,
The control unit controls transmission of aggregate transmission information related to a radio frame for the one or more terminal devices to transmit the discovery signal;
The communication control apparatus according to claim 1.
The communication control device according to claim 9, wherein the individual transmission information is information indicating a use of inter-device communication for the terminal device or information indicating a cycle of transmission of the discovery signal by the terminal device.
The acquisition unit is configured to transmit individual detection information related to a radio frame for performing a detection process for the terminal device to detect the discovery signal by each of one or more terminal devices located in the region. , Get the individual detection information,
The control unit controls transmission of aggregate detection information related to a radio frame for the one or more terminal devices to perform the detection process.
The communication control apparatus according to claim 1.
The communication control device according to claim 11, wherein the individual detection information is information indicating a use of inter-device communication for the terminal device, or information indicating a cycle of the detection processing by the terminal device.
Obtaining radio frame information indicating a radio frame that is a unit time of cellular communication, and indicating the radio frame for transmitting a discovery signal that enables another device to discover a device that performs inter-device communication When,
Controlling transmission of the radio frame information to the terminal device by a processor;
Including a communication control method.
Acquisition of radio frame information indicating the radio frame for transmitting a discovery signal that is a radio frame that is a unit time of cellular communication and that allows another device to discover a device that performs inter-device communication And
A control unit that controls transmission of the discovery signal based on the radio frame information;
A terminal device comprising:
The radio frame information indicates a plurality of radio frames for transmitting the discovery signal,
Each of the plurality of radio frames corresponds to any one of two or more meanings;
The control unit controls transmission of the discovery signal so that the discovery signal is transmitted in a radio frame corresponding to a meaning to be notified among the plurality of radio frames.
The terminal device according to claim 14.
The terminal device according to claim 14, wherein the control unit controls transmission of the discovery signal so that the discovery signal is transmitted at a frequency according to a use of communication between devices.
The terminal device according to claim 16, wherein the control unit controls transmission of the discovery signal so that the discovery signal is transmitted at a period corresponding to a use of communication between devices.
The terminal apparatus according to claim 14, wherein the control unit controls transmission of the information to be notified so that the information to be notified is transmitted with a predetermined radio resource after the discovery signal is transmitted.
The discovery signal has a common signal sequence between terminal devices,
The control unit controls transmission of the information to be notified so that the information to be notified is transmitted by any one of a plurality of predetermined radio resources after the discovery signal is transmitted;
The terminal device according to claim 18.
The control unit transmits the predetermined plurality of radio resources from any one of the predetermined plurality of radio resources each time the discovery signal is transmitted. The terminal device according to claim 19, wherein transmission of the information to be notified is controlled so as to change to another radio resource among resources.
The acquisition unit acquires individual transmission information related to a radio frame for the terminal device to transmit the discovery signal,
The control unit controls transmission of the dedicated transmission information to a base station;
The terminal device according to claim 14.
The acquisition unit acquires aggregated detection information related to a radio frame for performing detection processing for detecting one or more terminal devices located in a region to detect the discovery signal,
The control unit controls transmission of the discovery signal based on the aggregate detection information.
The terminal device according to claim 14.
The terminal device according to claim 14, wherein the control unit controls transmission of system information including a system frame number.
A memory for storing the program;
One or more processors capable of executing the program;
With
The program is
Obtaining radio frame information indicating a radio frame that is a unit time of cellular communication, and indicating the radio frame for transmitting a discovery signal that enables another device to discover a device that performs inter-device communication When,
Controlling transmission of the discovery signal based on the radio frame information;
Is a program for executing
Information processing device.
An acquisition unit for acquiring radio frame information indicating a radio frame for transmitting a discovery signal that is a radio frame that is a unit time of cellular communication and that allows another device to discover a device that performs inter-device communication When,
A control unit for controlling a detection process for detecting the discovery signal based on the radio frame information;
A terminal device comprising:
The radio frame information indicates a plurality of radio frames for transmitting the discovery signal,
Each of the plurality of radio frames corresponds to any one of two or more meanings;
When the discovery signal is detected, the control unit identifies a meaning corresponding to a radio frame in which the detected discovery signal is transmitted among the plurality of radio frames.
The terminal device according to claim 25.
26. The terminal device according to claim 25, wherein the control unit controls the detection process so that the detection process is performed at a frequency according to a use of inter-device communication.
28. The terminal device according to claim 27, wherein the control unit controls the detection process so that the detection process is performed at a cycle according to a use of communication between devices.
The terminal device according to claim 25, wherein the control unit acquires information received by a predetermined radio resource for transmitting information to be notified after transmission of the discovery signal after detection of the discovery signal.
30. The control unit according to claim 29, wherein after the discovery signal is detected, the control unit acquires information received by each of a plurality of predetermined radio resources for transmitting the information to be notified after transmission of the discovery signal. Terminal equipment.
The acquisition unit acquires aggregate transmission information related to a radio frame for transmitting one or more terminal devices located in a region to transmit the discovery signal,
The control unit controls the detection process based on the aggregate transmission information.
The terminal device according to claim 25.
The acquisition unit acquires individual detection information related to a radio frame for the terminal device to perform the detection process,
The control unit controls transmission of the individual detection information to a base station;
The terminal device according to claim 25.
The control unit performs the detection process at a first frequency when the mode of the terminal device is a connection mode, and more than the first frequency when the mode of the terminal device is an idle mode. The terminal device according to claim 25, wherein the detection process is controlled so that the detection process is performed at a low second frequency.
The terminal device according to claim 25, wherein the control unit controls transmission of system information including a system frame number.
A memory for storing the program;
One or more processors capable of executing the program;
With
The program is
Acquiring radio frame information indicating a radio frame that is a unit time of cellular communication and that transmits a discovery signal that enables another device to discover a device that performs inter-device communication; ,
Controlling a detection process for detecting the discovery signal based on the radio frame information;
Is a program for executing
Information processing device.